Graphene: Relativistic transport in a nearly perfect quantum liquid (2009)
Mueller, Markus, Fritz, Lars, Sachdev, Subir, Schmalian, Joerg
Electrons and holes in clean, charge-neutral graphene behave like a strongly coupled relativistic liquid. The thermo-electric transport properties of the interacting Dirac quasiparticles are rather...
We investigate magento-oscillations in the specific heat of non-relativistic fermions with a Fermi surface minimally coupled to a fluctuating U(1) gauge field. Our study is motivated by the recent...
Finite temperature dissipation and transport near quantum critical points (2009)
I review a variety of model systems and their quantum critical points, motivated by recent experimental and theoretical developments. These are used to present a general discussion of the non-zero...
Quantum criticality and the phase diagram of the cuprates (2009)
I discuss a proposed phase diagram of the cuprate superconductors as a function of temperature, carrier concentration, and a strong magnetic field perpendicular to the layers. I show how the phase...
Black hole determinants and quasinormal modes (2009)
Denef, Frederik, Hartnoll, Sean A., Sachdev, Subir
We derive an expression for functional determinants in thermal spacetimes as a product over the corresponding quasinormal modes. As simple applications we give efficient computations of scalar...
Quantum oscillations and black hole ringing (2009)
Denef, Frederik, Hartnoll, Sean A., Sachdev, Subir
We show that strongly coupled field theories with holographic gravity duals at finite charge density and low temperatures can undergo de Haas - van Alphen quantum oscillations as a function of an...
Quasiparticle Nernst effect in stripe-ordered cuprates (2009)
Hackl, Andreas, Vojta, Matthias, Sachdev, Subir
Experiments on underdoped cuprate superconductors suggest an intricate relation between the normal-state Nernst effect and stripe order: The Nernst signal appears enhanced near 1/8 hole doping and...
Fluctuating spin density waves in metals (2009)
Sachdev, Subir, Metlitski, Max A., Qi, Yang, Xu, Cenke
Recent work has used a U(1) gauge theory to describe the physics of Fermi pockets in the presence of fluctuating spin density wave order. We generalize this theory to an arbitrary band structure and...
Where is the quantum critical point in the cuprate superconductors? (2009)
Transport measurements in the hole-doped cuprates show a `strange metal' normal state with an electrical resistance which varies linearly with temperature. This strange metal phase is often...
Competition between spin density wave order and superconductivity in the underdoped cuprates (2009)
Moon, Eun Gook, Sachdev, Subir
We describe the interplay between d-wave superconductivity and spin density wave (SDW) order in a theory of the hole-doped cuprates at hole densities below optimal doping. The theory assumes local...
Entanglement Entropy in the O(N) model (2009)
Metlitski, Max A., Fuertes, Carlos A., Sachdev, Subir
It is generally believed that in spatial dimension d > 1 the leading contribution to the entanglement entropy S = - tr rho_A log rho_A scales as the area of the boundary of subsystem A. The...
Magnetization of the Shastry-Sutherland antiferromagnet near the Ising limit (2009)
Motivated by recent experiments on TmB4 (arXiv:0712.1537), we examine the phase diagram of the Shastry-Sutherland antiferromagnet in an applied magnetic field in the limit of strong Ising anisotropy....
Exotic phases and quantum phase transitions: model systems and experiments (2009)
I survey theoretical advances in our understanding of the quantum phases and phase transitions of Mott insulators, and of allied conducting systems obtained by doping charge carriers. A number of new...
We study experimental signatures of the Ising nematic quantum phase transition in d-wave superconductors, associated with the change of lattice symmetry from tetragonal to orthorhombic in the...
Paired electron pockets in the hole-doped cuprates (2009)
Galitski, Victor, Sachdev, Subir
We propose a theory for the underdoped hole-doped cuprates, focusing on the "nodal-anti-nodal dichotomy" observed in recent experiments. Our theory begins with an ordered antiferromagnetic Fermi...
We present a general approach to understanding the quantum phases and phase transitions of quantum antiferromagnets in two spatial dimensions. We begin with the simplest spin liquid state, the Z_2...
Durst, Adam C., Sachdev, Subir
In light of the evidence that charge order coexists with d-wave superconductivity in the underdoped cuprate superconductors, we investigate the manner in which such charge order will influence the...
Relativistic magnetotransport in graphene (2008)
Mueller, Markus, Fritz, Lars, Sachdev, Subir, Schmalian, Joerg
We study the thermal and electric transport of a fluid of interacting Dirac fermions as they arise in single-layer graphene. We include Coulomb interactions, a dilute density of charged impurities...
Quantum criticality and black holes (2008)
Sachdev, Subir, Mueller, Markus
Many condensed matter experiments explore the finite temperature dynamics of systems near quantum critical points. Often, there are no well-defined quasiparticle excitations, and so quantum kinetic...
Dynamics and transport of the Z_2 spin liquid: application to kappa-(ET)2Cu2(CN)3 (2008)
Qi, Yang, Xu, Cenke, Sachdev, Subir
We describe neutron scattering, NMR relaxation, and thermal transport properties of Z_2 spin liquids in two dimensions. Comparison to recent experiments on the spin S=1/2 triangular lattice...
Quantum Hall to Insulator Transition in the Bilayer Quantum Hall Ferromagnet (2008)
Murthy, Ganpathy, Sachdev, Subir
We describe a new phase transition of the bilayer quantum Hall ferromagnet at filling fraction $\nu = 1$. In the presence of static disorder (modeled by a periodic potential), bosonic $S=1/2$ spinons...
Imaging bond order near non-magnetic impurities in square lattice antiferromagnets (2008)
Kaul, Ribhu K., Melko, Roger G., Metlitski, Max A., Sachdev, Subir
We study the textures of generalized "charge densities" (scalar objects invariant under time reversal), in the vicinity of non-magnetic impurities in square-lattice quantum anti-ferromagnets, by...
Deconfined criticality and supersymmetry (2008)
We make connections between studies in the condensed matter literature on quantum phase transitions in square lattice antiferromagnets, and results in the particle theory literature on abelian...
Edge and impurity response in two-dimensional quantum antiferromagnets (2008)
Metlitski, Max A., Sachdev, Subir
Motivated by recent Monte-Carlo simulations of Hoglund and Sandvik (arXiv:0808.0408), we study edge response in square lattice quantum antiferromagnets. We use the O(3) non-linear sigma-model to...
Theory of the pairbreaking superconductor-metal transition in nanowires (2008)
Del Maestro, Adrian, Rosenow, Bernd, Sachdev, Subir
We present a detailed description of a zero temperature phase transition between superconducting and diffusive metallic states in very thin wires due to a Cooper pair breaking mechanism. The...
Xu, Cenke, Qi, Yang, Sachdev, Subir
The newly discovered high temperature superconductor SmFeAs(O1-xFx) shows a clear nematic transition where the square lattice of Fe ions has a rectangular distortion. Similar nematic ordering has...
Renormalization group theory of nematic ordering in d-wave superconductors (2008)
We examine the quantum theory of the spontaneous breaking of lattice rotation symmetry in d-wave superconductors on the square lattice. This is described by a field theory of an Ising nematic order...
Quantum-critical relativistic magnetotransport in graphene (2008)
Mueller, Markus, Fritz, Lars, Sachdev, Subir
We study the thermal and electric transport of a fluid of interacting Dirac fermions using a Boltzmann approach. We include Coulomb interactions, a dilute density of charged impurities and the...
Ising and Spin orders in Iron-based Superconductors (2008)
Xu, Cenke, Mueller, Markus, Sachdev, Subir
Motivated by recent neutron scattering experiments, we study the ordering of spins in the iron-based superconductors La(O_{1-x}F_x)FeAs, assuming them in proximity to a Mott insulator in the phase...
Destruction of Neel order in the cuprates by electron-doping (2008)
Kaul, Ribhu K., Metlitski, Max A., Sachdev, Subir, Xu, Cenke
Motivated by the evidence in PCCO and NCCO of a magnetic quantum critical point at which Neel order is destroyed, we study the evolution with doping of the T=0 quantum phases of the electron doped...
Radio frequency spectroscopy of a strongly imbalanced Feshbach-resonant Fermi gas (2008)
Veillette, Martin, Moon, Eun Gook, Lamacraft, Austen, Radzihovsky, Leo, Sachdev, Subir, Sheehy, D. E.
A sufficiently large species imbalance (polarization) in a two-component Feshbach resonant Fermi gas is known to drive the system into its normal state. We show that the resulting...
Quantum critical transport in clean graphene (2008)
Fritz, Lars, Schmalian, Joerg, Mueller, Markus, Sachdev, Subir
We describe electrical transport in ideal single-layer graphene at zero applied bias. There is a crossover from collisionless transport at frequencies larger than k_B T/hbar (T is the temperature) to...
Infinite randomness fixed point of the superconductor-metal quantum phase transition (2008)
Del Maestro, Adrian, Rosenow, Bernd, Mueller, Markus, Sachdev, Subir
We examine the influence of quenched disorder on the superconductor-metal transition, as described by a theory of overdamped Cooper pairs which repel each other. The self-consistent pairing...
Nodal quasiparticles and the onset of spin density wave order in the cuprates (2008)
Pelissetto, Andrea, Sachdev, Subir, Vicari, Ettore
We present a theory for the onset of spin density wave order in the superconducting ground state of the cuprates. We compute the scaling dimensions of allowed perturbations of a `relativistic' fixed...
Collective cyclotron motion of the relativistic plasma in graphene (2008)
Mueller, Markus, Sachdev, Subir
We present a theory of the finite temperature thermo-electric response functions of graphene, in the hydrodynamic regime induced by electron-electron collisions. In moderate magnetic fields, the...
Kaul, Ribhu K., Sachdev, Subir
We consider relativistic U(1) gauge theories in 2+1 dimensions, with N_b species of complex bosons and N_f species of Dirac fermions at finite temperature. The quantum phase transition between the...
A square lattice algebraic spin liquid with SO(5) symmetry (2007)
We propose a critical spin liquid ground state for S=1/2 antiferromagnets on the square lattice. In a renormalization group analysis of the `staggered flux' algebraic spin liquid, we examine...
Quantum magnetism and criticality (2007)
Magnetic insulators have proved to be fertile ground for studying new types of quantum many body states, and I survey recent experimental and theoretical examples. The insights and methods transfer...
Insulator-metal transition on the triangular lattice (2007)
Mott insulators with a half-filled band of electrons on the triangular lattice have been recently studied in a variety of organic compounds. All of these compounds undergo transitions to...
Valence bond solid order near impurities in two-dimensional quantum antiferromagnets (2007)
Metlitski, Max A., Sachdev, Subir
Recent scanning tunnelling microscopy (STM) experiments on underdoped cuprates have displayed modulations in the local electronic density of states which are centered on a Cu-O-Cu bond (Kohsaka et....
Theory of N\'eel and Valence-Bond-Solid Phases on the Kagome Lattice of Zn-paratacamite (2007)
Lawler, Michael J., Fritz, Lars, Kim, Yong Baek, Sachdev, Subir
Recently, neutron scattering data on powder samples of Zn-paratacamite, Zn$_x$Cu$_{4-x}$(OH)$_6$Cl$_{2}$, with small Zn concentration has been interpreted as evidence for valence bond solid and...
Del Maestro, Adrian, Rosenow, Bernd, Shah, Nayana, Sachdev, Subir
We describe the thermal and electrical conductivities of quasi-one dimensional wires, across a quantum phase transition from a superconductor to a metal induced by pairbreaking perturbations....
Moon, Eun Gook, Nikolic, Predrag, Sachdev, Subir
We consider spin-1/2 fermions of mass m with interactions near the unitary limit. In an applied periodic potential of amplitude V and period a, and with a density of an even integer number of...
Coulomb impurity in graphene (2007)
Biswas, Rudro R., Sachdev, Subir, Son, Dam T.
We consider the problem of screening of an electrically charged impurity in a clean graphene sheet. When electron-electron interactions are neglected, the screening charge has a sign opposite to that...
Hartnoll, Sean A., Kovtun, Pavel K., Mueller, Markus, Sachdev, Subir
We present a general hydrodynamic theory of transport in the vicinity of superfluid-insulator transitions in two spatial dimensions described by "Lorentz"-invariant quantum critical points. We allow...
Algebraic charge liquids (2007)
Kaul, Ribhu K., Kim, Yong Baek, Sachdev, Subir, Senthil, T.
High temperature superconductivity emerges in the cuprate compounds upon changing the electron density of an insulator in which the electron spins are antiferromagnetically ordered. A key...
Hole dynamics in an antiferromagnet across a deconfined quantum critical point (2007)
Kaul, Ribhu K, Kolezhuk, Alexei, Levin, Michael, Sachdev, Subir, Senthil, T
We study the effects of a small density of holes, $\delta$, on a square-lattice antiferromagnet undergoing a continuous transition from a Neel state to a valence bond solid at a deconfined quantum...
Theory of the nodal nematic quantum phase transition in superconductors (2007)
Kim, Eun-Ah, Lawler, Michael J., Oreto, Paul, Sachdev, Subir, Fradkin, Eduardo, Kivelson, Steven A.
We study the character of an Ising nematic quantum phase transition (QPT) deep inside a d-wave superconducting state with nodal quasiparticles in a two-dimensional tetragonal crystal. We find that,...
Metlitski, Max A., Sachdev, Subir
We describe the spin distribution in the vicinity of a non-magnetic impurity in a two-dimensional antiferromagnet undergoing a transition from a magnetically ordered Neel state to a paramagnet with a...
Spin dynamics across the superfluid-insulator transition of spinful bosons (2007)
Powell, Stephen, Sachdev, Subir
Bosons with non-zero spin exhibit a rich variety of superfluid and insulating phases. Most phases support coherent spin oscillations, which have been the focus of numerous recent experiments. These...
Hole dynamics in an antiferromagnet across a deconfined quantum critical point (2007)
Kaul, Ribhu K., Kolezhuk, Alexei, Levin, Michael, Sachdev, Subir, Senthil, T.
We study the effects of a small density of holes, delta, on a square lattice antiferromagnet undergoing a continuous transition from a Neel state to a valence bond solid at a deconfined quantum...
Quantum critical transport, duality, and M-theory (2007)
Herzog, Christopher P., Kovtun, Pavel, Sachdev, Subir, Son, Dam Thanh
We consider charge transport properties of 2+1 dimensional conformal field theories at non-zero temperature. For theories with only Abelian U(1) charges, we describe the action of particle-vortex...
Hole dynamics in an antiferromagnet across a deconfined quantum critical point (2007)
Kaul, Ribhu K, Kolezhuk, Alexei, Levin, Michael, Sachdev, Subir, Senthil, T
We study the effects of a small density of holes, $\delta$, on a square-lattice antiferromagnet undergoing a continuous transition from a Neel state to a valence bond solid at a deconfined quantum...
Dual vortex theory of doped Mott insulators (2006)
We present a general framework for describing the quantum phases obtained by doping paramagnetic Mott insulators on the square lattice. The undoped insulators are efficiently characterized by the...
Fermi surface change across a deconfined quantum critical point (2006)
Kaul, Ribhu K., Kolezhuk, Alexei, Levin, Michael, Sachdev, Subir, Senthil, T.
The quantum phase transitions of metals have been extensively studied in the rare-earth "heavy electron" materials, the cuprates, and related compounds. The Fermi surface of the metal often has...
Impurity induced spin texture in quantum critical 2D antiferromagnets (2006)
Hoglund, Kaj H., Sandvik, Anders W., Sachdev, Subir
We describe the uniform and staggered magnetization distributions around a vacancy in a quantum critical two-dimensional S=1/2 antiferromagnet. The distributions are delocalized across the entire...
Nikolic, Predrag, Sachdev, Subir
It has long been known that particles with short-range repulsive interactions in spatial dimension d=1 form universal quantum liquids in the low density limit: all properties can be related to those...
Excited state spectra at the superfluid-insulator transition out of paired condensates (2006)
Powell, Stephen, Sachdev, Subir
We describe gapped single-particle and collective excitations across a superfluid to insulator quantum phase transition of particles (bosons or fermions) in a periodic potential, with an even number...
Low energy theory of a single vortex and electronic quasiparticles in a d-wave superconductor (2006)
Nikolic, Predrag, Sachdev, Subir
We highlight the properties of a simple model (contained in our recent work) of the quantum dynamics of a single point vortex interacting with the nodal fermionic quasiparticles of a d-wave...
Theory of quantum impurities in spin liquids (2006)
Kolezhuk, Alexei, Sachdev, Subir, Biswas, Rudro R., Chen, Peiqiu
We describe spin correlations in the vicinity of a generalized impurity in a wide class of fractionalized spin liquid states. We argue that the primary characterization of the impurity is its...
Nikolic, Predrag, Sachdev, Subir, Bartosch, Lorenz
We introduce a simple model of the low energy electronic states in the vicinity of a vortex undergoing quantum zero-point motion in a d-wave superconductor. The vortex is treated as a point flux...
Bartosch, Lorenz, Sachdev, Subir
We compute the influence of the quantum zero-point motion of a vortex on the electronic quasiparticle spectra of s-wave superconductors. The vortex is assumed to be pinned by a harmonic potential,...
From stripe to checkerboard order on the square lattice in the presence of quenched disorder (2006)
Del Maestro, Adrian, Rosenow, Bernd, Sachdev, Subir
We discuss the effects of quenched disorder on a model of charge density wave (CDW) ordering on the square lattice. Our model may be applicable to the cuprate superconductors, where a random...
Detecting the quantum zero-point motion of vortices in the cuprate superconductors (2006)
Bartosch, Lorenz, Balents, Leon, Sachdev, Subir
We explore the experimental implications of a recent theory of the quantum dynamics of vortices in two-dimensional superfluids proximate to Mott insulators. The theory predicts modulations in the...
Fermi surfaces and Luttinger's theorem in paired fermion systems (2006)
We discuss ground state properties of a mixture of two fermion species which can bind to form a molecular boson. When the densities of the fermions are unbalanced, one or more Fermi surfaces can...
Quantum criticality of a Fermi gas with a spherical dispersion minimum (2005)
We describe the quantum phase transition of a Fermi gas occurring when the quasiparticle excitation energy has a minimum in momentum space which crosses zero on a sphere of radius k_0 \neq 0. The...
Effective action for vortex dynamics in clean d-wave superconductors (2005)
Nikolic, Predrag, Sachdev, Subir
We describe the influence of the gapless, nodal, fermionic quasiparticles of a two-dimensional d-wave superconductor on the motion of vortices. A continuum, functional formalism is used to obtain the...
Magnon decay in gapped quantum spin systems (2005)
Kolezhuk, Alexei, Sachdev, Subir
In the O(3) sigma-model description of gapped spin systems, S=1 magnons can only decay into three lower energy magnons. We argue that the symmetry of the quantum spin Hamiltonian often allows decay...
Podolsky, Daniel, Vishwanath, Ashvin, Moore, Joel, Sachdev, Subir
We study electric, thermal, and thermoelectric conductivities in the vicinity of a z=2 superconductor-diffusive metal transition in two dimensions, both in the high and low frequency limits. We find...
Quantum critical dynamics of the two-dimensional Bose gas (2005)
Sachdev, Subir, Dunkel, Emily R.
The dilute, two-dimensional Bose gas exhibits a novel regime of relaxational dynamics in the regime k_B T > |\mu| where T is the absolute temperature and \mu is the chemical potential. This may also...
A semiclassical approach to the low-temperature real time dynamics of generic one-dimensional, gapped models in the sine-Gordon model universality class is developed. Asymptotically exact universal...
Competing Orders and non-Landau-Ginzburg-Wilson Criticality in (Bose) Mott transitions (2005)
Balents, Leon, Bartosch, Lorenz, Burkov, Anton, Sachdev, Subir, Sengupta, K.
This paper reviews a recent non-Landau-Ginzburg-Wilson (LGW) approach to superfluid to Mott insulator transitions in two dimensional bosonic lattice systems, using a dual vortex field theory...
Depletion of the Bose-Einstein condensate in Bose-Fermi mixtures (2005)
Powell, Stephen, Sachdev, Subir, Buchler, Hans Peter
We describe the properties of a mixture of fermionic and bosonic atoms, as they are tuned across a Feshbach resonance associated with a fermionic molecular state. Provided the number of fermionic...
Estimating the mass of vortices in the cuprate superconductors (2005)
Bartosch, Lorenz, Balents, Leon, Sachdev, Subir
We explore the experimental implications of a recent theory of the quantum dynamics of vortices in superfluids proximate to Mott insulators (cond-mat/0408329 and cond-mat/0409470). The theory...
Quantum spin chains with site dissipation (2004)
Werner, Philipp, Troyer, Matthias, Sachdev, Subir
We use Monte Carlo simulations to study chains of Ising- and XY-spins with dissipation coupling to the site variables. The phase diagram and critical exponents of the dissipative Ising chain in a...
Thermal melting of density waves on the square lattice (2004)
Del Maestro, Adrian, Sachdev, Subir
We present the theory of the effect of thermal fluctuations on commensurate "p x p" density wave ordering on the square lattice (p >= 3, integer). For the case in which this order is lost by a second...
Low temperature broken symmetry phases of spiral antiferromagnets (2004)
Capriotti, Luca, Sachdev, Subir
We study Heisenberg antiferromagnets with nearest- (J1) and third- (J3) neighbor exchange on the square lattice. In the limit of large spin S, there is a zero temperature (T) Lifshitz point at J3 =...
Competing orders II: the doped quantum dimer model (2004)
Balents, Leon, Bartosch, Lorenz, Burkov, Anton, Sachdev, Subir, Sengupta, K.
We study the phases of doped spin S=1/2 quantum antiferromagnets on the square lattice, as they evolve from paramagnetic Mott insulators with valence bond solid (VBS) order at zero doping, to...
Quantum phase transitions out of the heavy Fermi liquid (2004)
Senthil, T., Sachdev, Subir, Vojta, Matthias
We review recent work on the instability of the heavy Fermi liquid state (FL) of the Kondo lattice towards a magnetic metal in which the local moments are not part of the Fermi sea. Using insights...
Phenomenological lattice model for dynamic spin and charge fluctuations in the cuprates (2004)
Vojta, Matthias, Sachdev, Subir
Motivated by recent neutron scattering experiments on the cuprate superconductors, we present a phenomenological framework describing the dynamics of collective spin excitations coupled to...
Putting competing orders in their place near the Mott transition (2004)
Balents, Leon, Bartosch, Lorenz, Burkov, Anton, Sachdev, Subir, Sengupta, K.
We describe the localization transition of superfluids on two-dimensional lattices into commensurate Mott insulators with average particle density p/q (p, q relatively prime integers) per lattice...
Deconfined criticality critically defined (2004)
Senthil, T., Balents, Leon, Sachdev, Subir, Vishwanath, Ashvin, Fisher, Matthew P. A.
We describe characteristic physical properties of the recently introduced class of deconfined quantum critical points. Using some simple models, we highlight observables which clearly distinguish...
Universal conductance of nanowires near the superconductor-metal quantum transition (2004)
Sachdev, Subir, Werner, Philipp, Troyer, Matthias
We consider wires near a zero temperature transition between superconducting and metallic states. The critical theory obeys hyperscaling, which leads to a universal frequency, temperature, and length...
Large N expansion for frustrated and doped quantum antiferromagnets (2004)
A large N expansion technique, based on symplectic (Sp(N)) symmetry, for frustrated magnetic systems is studied. The phase diagram of a square lattice, spin S, quantum antiferromagnet with first,...
Quantum phases and phase transitions of Mott insulators (2004)
This article contains a theoretical overview of the physical properties of antiferromagnetic Mott insulators in spatial dimensions greater than one. Many such materials have been experimentally...
Quantum criticality beyond the Landau-Ginzburg-Wilson paradigm (2003)
Senthil, T., Balents, Leon, Sachdev, Subir, Vishwanath, Ashvin, Fisher, Matthew P. A.
We present the critical theory of a number of zero temperature phase transitions of quantum antiferromagnets and interacting boson systems in two dimensions. The most important example is the...
Quantum phase transition in an atomic Bose gas with a Feshbach resonance (2003)
Romans, M. W. J., Duine, R. A., Sachdev, Subir, Stoof, H. T. C.
We show that in an atomic Bose gas near a Feshbach resonance a quantum phase transition occurs between a phase with only a molecular Bose-Einstein condensate and a phase with both an atomic and a...
Quench dynamics across quantum critical points (2003)
Sengupta, K., Powell, Stephen, Sachdev, Subir
We study the quantum dynamics of a number of model systems as their coupling constants are changed rapidly across a quantum critical point. The primary motivation is provided by the recent...
"Deconfined" quantum critical points (2003)
Senthil, T., Vishwanath, Ashvin, Balents, Leon, Sachdev, Subir, Fisher, M. P. A.
The theory of second order phase transitions is one of the foundations of modern statistical mechanics and condensed matter theory. A central concept is the observable `order parameter', whose...
The planar pyrochlore antiferromagnet: A large-N analysis (2003)
Bernier, Jean-Sebastien, Chung, Chung-Hou, Kim, Yong Baek, Sachdev, Subir
We study possible quantum phases of the Heisenberg antiferromagnet on the planar pyrochlore lattice, also known as the checkerboard lattice or the square lattice with crossings. It is assumed that...
Competing density-wave orders in a one-dimensional hard-boson model (2003)
Fendley, Paul, Sengupta, K., Sachdev, Subir
We describe the zero-temperature phase diagram of a model of bosons, occupying sites of a linear chain, which obey a hard-exclusion constraint: any two nearest-neighbor sites may have at most one...
Conductivity of thermally fluctuating superconductors in two dimensions (2003)
We review recent work on a continuum, classical theory of thermal fluctuations in two dimensional superconductors. A functional integral over a Ginzburg-Landau free energy describes the amplitude and...
Competing orders in thermally fluctuating superconductors in two dimensions (2003)
Sachdev, Subir, Demler, Eugene
We extend recent low temperature analyses of competing orders in the cuprate superconductors to the pseudogap regime where all orders are fluctuating. A universal continuum limit of a classical...
Absence of U(1) spin liquids in two dimensions (2003)
Herbut, Igor F., Seradjeh, Babak H., Sachdev, Subir, Murthy, Ganpathy
Many popular models of fractionalized spin liquids contain neutral fermionic spinon excitations on a Fermi surface, carrying unit charges under a compact U(1) gauge force. We argue that instanton...
Weak magnetism and non-Fermi liquids near heavy-fermion critical points (2003)
Senthil, T., Vojta, Matthias, Sachdev, Subir
This paper is concerned with the weak-moment magnetism in heavy-fermion materials and its relation to the non-Fermi liquid physics observed near the transition to the Fermi liquid. We explore the...
Pankov, Sergey, Florens, Serge, Georges, Antoine, Kotliar, Gabriel, Sachdev, Subir
We analyze the Hertz-Moriya-Millis theory of an antiferromagnetic quantum critical point, in the marginal case of two dimensions (d=2,z=2). Up to next-to-leading order in the number of components (N)...
Quantum impurity in a magnetic environment (2003)
A unified perspective is given on a number of different problems involving the coupling of a localized quantum spin degree of freedom to the low energy excitations of an antiferromagnet, a spin...
Field theories of paramagnetic Mott insulators (2003)
This is a summary of a central argument in recent review articles by the author (cond-mat/0109419, cond-mat/0211005, and cond-mat/0211027). An effective field theory is derived for the low energy...
Quantum impurity in an antiferromagnet: non-linear sigma model theory (2003)
Sachdev, Subir, Vojta, Matthias
We present a new formulation of the theory of an arbitrary quantum impurity in an antiferromagnet, using the O(3) non-linear sigma model. We obtain the low temperature expansion for the impurity spin...
Radiation-Induced Magnetoresistance Oscillations in a 2D Electron Gas (2003)
Durst, Adam C., Sachdev, Subir, Read, N., Girvin, S. M.
Recent measurements of a 2D electron gas subjected to microwave radiation reveal a magnetoresistance with an oscillatory dependence on the ratio of radiation frequency to cyclotron frequency. We...
Understanding correlated electron systems by a classification of Mott insulators (2002)
This article surveys the physics of systems proximate to Mott insulators, and presents a classification using conventional and topological order parameters. This classification offers a valuable...
Order and quantum phase transitions in the cuprate superconductors (2002)
It is now widely accepted that the cuprate superconductors are characterized by the same long-range order as that present in the Bardeen-Cooper-Schrieffer (BCS) theory: that associated with the...
Fractionalized Fermi liquids (2002)
Senthil, T., Sachdev, Subir, Vojta, Matthias
In spatial dimensions d >= 2, Kondo lattice models of conduction and local moment electrons can exhibit a fractionalized, non-magnetic state (FL*) with a Fermi surface of sharp electron-like...
Scratching the Bose surface (2002)
This is a `News and Views' article discussing recent proposals for ground states of many boson systems which are neither superfluids nor Mott insulators.
Polkovnikov, Anatoli, Sachdev, Subir, Vojta, Matthias
We present additional details of the scanning tunneling microscopy (STM) spectra predicted by the model of pinning of dynamic spin collective modes in d-wave superconductor proposed by Polkovnikov et...
Sachdev, Subir, Morinari, Takao
We describe two dimensional models with a metallic Fermi surface which display quantum phase transitions controlled by strongly interacting critical field theories below their upper critical...
Non-equilibrium Gross-Pitaevskii dynamics of boson lattice models (2002)
Polkovnikov, Anatoli, Sachdev, Subir, Girvin, S. M.
Motivated by recent experiments on trapped ultra-cold bosonic atoms in an optical lattice potential, we consider the non-equilibrium dynamic properties of such bosonic systems for a number of...
Mott insulators in strong electric fields (2002)
Sachdev, Subir, Sengupta, K., Girvin, S. M.
Recent experiments on ultracold atomic gases in an optical lattice potential have produced a Mott insulating state of Rb atoms. This state is stable to a small applied potential gradient (an...
Spin and charge order in the vortex lattice of the cuprates: experiment and theory (2002)
I summarize recent results, obtained with E. Demler, K. Park, A. Polkovnikov, M. Vojta, and Y. Zhang, on spin and charge correlations near a magnetic quantum phase transition in the cuprates. STM...
Pinning of dynamic spin density wave fluctuations in the cuprate superconductors (2002)
Polkovnikov, Anatoli, Vojta, Matthias, Sachdev, Subir
We present a theory of the pinning of dynamic spin density wave (SDW) fluctuations in a d-wave superconductor by local imperfections which preserve spin-rotation invariance, such as impurities or...
Tuning order in cuprate superconductors (2002)
Sachdev, Subir, Zhang, Shou-Cheng
This article presents our perspective on STM measurements by Hoffman et al. (cond-mat/0201348) of the vortex lattice in BSCCO. We discuss implications of these measurements for various theories of...
Competing orders in a magnetic field: spin and charge order in the cuprate superconductors (2001)
Zhang, Ying, Demler, Eugene, Sachdev, Subir
We describe two-dimensional quantum spin fluctuations in a superconducting Abrikosov flux lattice induced by a magnetic field applied to a doped Mott insulator. Complete numerical solutions of a...
We describe the zero temperature phases and phase boundaries of an effective lattice model for frustrated, easy-plane, spin S=1/2 quantum antiferromagnets. The model contains states with Neel and...
Magnetic field tuning of charge and spin order in the cuprate superconductors (2001)
Polkovnikov, Anatoli, Sachdev, Subir, Vojta, Matthias, Demler, Eugene
Recent neutron scattering, nuclear magnetic resonance, and scanning tunneling microscopy experiments have yielded valuable new information on the interplay between charge and spin density wave order...
Finite temperature dynamics near quantum phase transitions (2001)
We review the non-zero temperature relaxational dynamics of quantum systems near a zero temperature, second-order phase transition. We begin with the quantum Ising chain, for which universal and...
Quantum phase transitions of correlated electrons in two dimensions (2001)
We review the theories of a few quantum phase transitions in two-dimensional correlated electron systems and discuss their application to the cuprate high temperature superconductors. The...
Quantum spin glass transition in the two-dimensional electron gas (2001)
We discuss the possibility of spin glass order in the vicinity of the unexpected metallic state of the two-dimensional electron gas in zero applied magnetic field. An average ferromagnetic moment may...
Ground states of quantum antiferromagnets in two dimensions (2001)
We explore the ground states and quantum phase transitions of two-dimensional, spin S=1/2, antiferromagnets by generalizing lattice models and duality transforms introduced by Sachdev and Jalabert...
Spin and charge order in Mott insulators and d-wave superconductors (2001)
We argue that aspects of the anomalous, low temperature, spin and charge dynamics of the high temperature superconductors can be understood by studying the corresponding physics of undoped Mott...
Tunneling gap of laterally separated quantum Hall states (2001)
Kollar, Marcus, Sachdev, Subir
We use a method of matched asymptotics to determine the energy gap of two counter-propagating, strongly interacting, quantum Hall edge states. The microscopic edge state dispersion and Coulomb...
The ground states and excitations of two-dimensional insulating and doped Mott insulators are described by a bond operator formalism. While the method represents the degrees of freedom of an...
Quantum phase transitions and collective modes in d-wave superconductors (2001)
Vojta, Matthias, Sachdev, Subir
Fluctuations near second-order quantum phase transitions in d-wave superconductors can cause strong damping of fermionic excitations, as observed in photoemission experiments. The damping of the...
Spin ordering quantum transitions of superconductors in a magnetic field (2001)
Demler, Eugene, Sachdev, Subir, Zhang, Ying
We argue that recent neutron scattering measurements by Lake et. al. (Science 291, 1759 (2001)) of the spin excitation spectrum of LSCO in a magnetic field can be understood in terms of proximity to...
Quantum Phases of the Shastry-Sutherland Antiferromagnet (2001)
Chung, C. H., Marston, J. B., Sachdev, Subir
We study possible paramagnetic phases of antiferromagnets on the Shastry-Sutherland lattice by a gauge-theoretic analysis of fluctuations in a theory with Sp(2N) symmetry. In addition to the familiar...
Sachdev, Subir, Starykh, Oleg A.
We compare the neutron measurements of Kim et al. (cond-mat/0012239) on two-dimensional, S=1/2 antiferromagnets with the continuum quasiclassical theory of S. Sachdev and O.A. Starykh...
Spin orthogonality catastrophe in two-dimensional antiferromagnets and superconductors (2000)
Sachdev, Subir, Troyer, Matthias, Vojta, Matthias
We compute the spectral function of a spin S hole injected into a two-dimensional antiferromagnet or superconductor in the vicinity of a magnetic quantum critical point. We show that, near van Hove...
Static hole in a critical antiferromagnet: field-theoretic renormalization group (2000)
We consider the quantum field theory of a single, immobile, spin S hole coupled to a two-dimensional antiferromagnet at a bulk quantum critical point between phases with and without magnetic...
Quantum Criticality: competing ground states in low dimensions (2000)
Small changes in an external parameter can often lead to dramatic qualitative changes in the lowest energy quantum mechanical ground state of a correlated electron system. In anisotropic crystals,...
Non-magnetic impurities as probes of insulating and doped Mott insulators in two dimensions (2000)
Sachdev, Subir, Vojta, Matthias
We characterize paramagnetic Mott insulators by their response to static, non-magnetic impurities. States with spinon deconfinement (or spin-charge separation) are distinguished from those with...
Renormalization group analysis of quantum critical points in d-wave superconductors (2000)
Vojta, Matthias, Zhang, Ying, Sachdev, Subir
We describe a search for renormalization group fixed points which control a second-order quantum phase transition between a d_{x^2-y^2} superconductor and some other superconducting ground state....
Impurity in a d-wave superconductor: Kondo effect and STM spectra (2000)
Polkovnikov, Anatoli, Sachdev, Subir, Vojta, Matthias
We present a theory for recent STM studies of Zn impurities in the superconductor BSCCO, using insights from NMR experiments which show that there is a net S=1/2 moment on the Cu ions near the Zn. We...
Quantum phase transitions in d-wave superconductors (2000)
Vojta, Matthias, Zhang, Ying, Sachdev, Subir
Motivated by the strong, low temperature damping of nodal quasiparticles observed in some cuprate superconductors, we study quantum phase transitions in d_{x^2-y^2} superconductors with a...
Damping of collective modes and quasiparticles in d-wave superconductors (2000)
Sachdev, Subir, Vojta, Matthias
The two-dimensional d-wave superconducting state of the high temperature superconductors has a number of different elementary excitations: the spin-singlet Cooper pairs, the spin S=1/2 fermionic...
Quantum Impurity in a Nearly Critical Two Dimensional Antiferromagnet (2000)
Sachdev, Subir, Buragohain, Chiranjeeb, Vojta, Matthias
We describe the spin dynamics of an arbitrary localized impurity in an insulating two dimensional antiferromagnet, across the host transition from a paramagnet with a spin gap to a Neel state. The...
Competing orders and quantum criticality in doped antiferromagnets (2000)
Vojta, Matthias, Zhang, Ying, Sachdev, Subir
We use a number of large-N limits to explore the competition between ground states of square lattice doped antiferromagnets which break electromagnetic U(1), time-reversal, or square lattice space...
Impurity spin dynamics in 2D antiferromagnets and superconductors (2000)
Vojta, Matthias, Buragohain, Chiranjeeb, Sachdev, Subir
We discuss the universal theory of localized impurities in the paramagnetic state of 2D antiferromagnets where the spin gap is assumed to be significantly smaller than a typical exchange energy. We...
Quantum impurity dynamics in two-dimensional antiferromagnets and superconductors (1999)
Vojta, Matthias, Buragohain, Chiranjeeb, Sachdev, Subir
We present the universal theory of arbitrary, localized impurities in a confining paramagnetic state of two-dimensional antiferromagnets with global SU(2) spin symmetry. The energy gap of the host...
Translational symmetry breaking in two-dimensional antiferromagnets and superconductors (1999)
Sachdev, Subir, Vojta, Matthias
It was argued many years ago that translational symmetry breaking due to the appearance of spin-Peierls ordering (or bond-charge stripe order) is a fundamental property of the quantum paramagnetic...
Mean-Field Theory of a Quantum Heisenberg Spin Glass (1999)
Georges, Antoine, Parcollet, Olivier, Sachdev, Subir
A full mean field solution of a quantum Heisenberg spin glass model is presented in a large-N limit. A spin glass transition is found for all values of the spin S. The quantum critical regime...
Quantum phase transitions in antiferromagnets and superfluids (1999)
Sachdev, Subir, Vojta, Matthias
We present a general introduction to the non-zero temperature dynamic and transport properties of low-dimensional systems near a quantum phase transition. Basic results are reviewed in the context of...
Charge order, superconductivity, and a global phase diagram of doped antiferromagnets (1999)
Vojta, Matthias, Sachdev, Subir
We investigate the interplay between lattice-symmetry breaking and superconducting order in a two-dimensional model of doped antiferromagnets, with long-range Coulomb interactions and Sp(2N) spin...
Comment on "Spin Transport properties of the quantum one-dimensional non-linear sigma model" (1999)
In a recent preprint (cond-mat/9905415), Fujimoto has used the Bethe ansatz to compute the finite temperature, zero frequency Drude weight of spin transport in the quantum O(3) non-linear sigma model...
Thermally fluctuating superconductors in two dimensions (1999)
Sachdev, Subir, Starykh, Oleg A.
We describe the different regimes of finite temperature dynamics in the vicinity of a zero temperature superconductor to insulator quantum phase transition in two dimensions. New results are obtained...
Quantum Conductors in a Plane (1999)
Phillips, Philip, Sachdev, Subir, Kravchenko, Sergey, Yazdani, Ali
When electrons are confined to move in a plane, strange things happen. For example, under normal circumstances, they are not expected to conduct electricity at low temperatures. However, recent...
High temperature relaxational dynamics in low-dimensional quantum field theories (1998)
This paper presents a unified perspective on the results of two recent works (C. Buragohain and S. Sachdev cond-mat/9811083 and S. Sachdev cond-mat/9810399) along with additional background. We...
Intermediate temperature dynamics of one-dimensional Heisenberg antiferromagnets (1998)
Buragohain, Chiranjeeb, Sachdev, Subir
We present a general theory for the intermediate temperature (T) properties of Heisenberg antiferromagnets of spin-S ions on p-leg ladders, valid for 2Sp even or odd. Following an earlier proposal...
Universal relaxational dynamics near two-dimensional quantum-critical points (1998)
We describe the nonzero temperature (T), low frequency (\omega) dynamics of the order parameter near quantum critical points in two spatial dimensions (d), with a special focus on the regime...
Universal critical temperature for Kosterlitz-Thouless transitions in bilayer quantum magnets (1998)
Troyer, Matthias, Sachdev, Subir
Recent experiments show that double layer quantum Hall systems may have a ground state with canted antiferromagnetic order. In the experimentally accessible vicinity of a quantum critical point, the...
Coulomb interactions at quantum Hall critical points of systems in a periodic potential (1997)
We study the consequences of long-range Coulomb interactions at the critical points between integer/fractional quantum Hall states and an insulator. We use low energy theories for such transitions in...
We present the theory of nonzero temperature ($T$) spin dynamics and transport in one-dimensional Heisenberg antiferromagnets with an energy gap $\Delta$. For $T
Canted antiferromagnetic and spin singlet quantum Hall states in double-layer systems (1997)
Zheng, Lian, Sachdev, Subir, Sarma, S. Das
We present details of earlier studies (Zheng et al, Phys. Rev. Lett. 78, 310 (1997) and Das Sarma et al, ibid 79, 917 (1997)) and additional new results on double-layer quantum Hall systems at a...
Nonzero temperature transport near fractional quantum Hall critical points (1997)
In an earlier work, Damle and the author (Phys. Rev. B in press; cond-mat/9705206) demonstrated the central role played by incoherent, inelastic processes in transport near two-dimensional quantum...
Dynamics and transport near quantum-critical points (1997)
The physics of non-zero temperature dynamics and transport near quantum-critical points is discussed by a detailed study of the O(N)-symmetric, relativistic, quantum field theory of a N-component...
Non-zero temperature transport near quantum critical points (1997)
We describe the nature of charge transport at non-zero temperatures ($T$) above the two-dimensional ($d$) superfluid-insulator quantum critical point. We argue that the transport is characterized by...
Magnetic properties of strongly disordered electronic systems (1997)
We present a unified, global perspective on the magnetic properties of strongly disordered electronic systems, with special emphasis on the case where the ground state is metallic. We review the...
Far from equilibrium dynamics of the Bose gas (1997)
Damle, Kedar, Majumdar, Satya N., Sachdev, Subir
We study the approach to equilibrium of a Bose gas to a superfluid state. We point out that dynamic scaling, characteristic of far from equilibrium phase-ordering systems, should hold. We stress the...
Gruzberg, Ilya A., Read, N., Sachdev, Subir
The directed network model describing chiral edge states on the surface of a cylindrical 3D quantum Hall system is known to map to a one-dimensional quantum ferromagnetic spin chain. Using the spin...
Double-layer quantum Hall antiferromagnetism at filling fraction nu=2/(odd integer) (1997)
Sarma, S. Das, Sachdev, Subir, Zheng, Lian
A low energy action for double-layer quantum Hall systems at filling fractions $\nu = 2/m$ ($m$ an odd integer) is introduced. Interlayer antiferromagnetic exchange induces a phase with canted spin...
Gruzberg, Ilya A., Read, N., Sachdev, Subir
We consider the directed network (DN) of edge states on the surface of a cylinder of length L and circumference C. By mapping it to a ferromagnetic superspin chain, and using a scaling analysis, we...
Low temperature spin diffusion in the one-dimensional quantum $O(3)$ nonlinear $\sigma$-model (1996)
An effective, low temperature, classical model for spin transport in the one-dimensional, gapped, quantum $O(3)$ non-linear $\sigma$-model is developed. Its correlators are obtained by a mapping to a...
Low temperature relaxational dynamics of the Ising chain in a transverse field (1996)
We present asymptotically exact results for the real time order parameter correlations of a class of d=1 Ising models in a transverse field at low temperatures (T) on both sides of the quantum...
Recent work on the zero temperature phases and phase transitions of strongly random electronic system is reviewed. The transition between the spin glass and quantum paramagnet is examined, for both...
Higher dimensional realizations of activated dynamic scaling at random quantum transitions (1996)
We show that many of the unusual properties of the one-dimensional random quantum Ising model are shared also by dilute quantum Ising systems in the vicinity of a certain quantum transition in {\em...
A systematic method for the computation of finite temperature ($T$) crossover functions near quantum critical points close to, or above, their upper-critical dimension is devised. We describe the...
Spin-Peierls states of quantum antiferromagnets on the $Ca V_4 O_9$ lattice (1996)
We discuss the quantum paramagnetic phases of Heisenberg antiferromagnets on the 1/5-depleted square lattice found in $Ca V_4 O_9$. The possible phases of the quantum dimer model on this lattice are...
Phase transition of a Bose gas in a harmonic potential (1996)
Damle, Kedar, Senthil, T., Majumdar, Satya N., Sachdev, Subir
We consider a dilute Bose gas confined by a harmonic potential. We define an appropriate thermodynamic limit and analyze the properties of the phases and phase transition in this limit. Critical...
Universal low-temperature properties of quantum and classical ferromagnetic chains (1996)
Takahashi, Minoru, Nakamura, Hiroaki, Sachdev, Subir
We identify the critical theory controlling the universal, low temperature, macroscopic properties of both quantum and classical ferromagnetic chains. The theory is the quantum mechanics of a single...
Multicritical crossovers near the dilute Bose gas quantum critical point (1996)
Many zero temperature transitions, involving the deviation in the value of a $U(1)$ conserved charge from a quantized value, are described by the dilute Bose gas quantum critical point. On such...
Zero temperature phase transitions in quantum Heisenberg ferromagnets (1996)
The purpose of this work is to understand the zero temperature phases, and the phase transitions, of Heisenberg spin systems which can have an extensive, spontaneous magnetic moment; this entails a...
Phase ordering kinetics of the Bose gas (1995)
Damle, Kedar, Majumdar, Satya, Sachdev, Subir
We study the approach to equilibrium of a Bose gas to a superfluid state. We point out that dynamic scaling, characteristic of far from equilibrium phase-ordering systems, should hold. We stress the...
We consider finite temperature properties of the Ising chain in a transverse field in the vicinity of its zero temperature, second order quantum phase transition. New universal crossover functions...
We study the finite temperature crossovers in the vicinity of a zero temperature quantum phase transition. The universal crossover functions are observables of a continuum quantum field theory....
Continuum quantum ferromagnets at finite temperature and the Quantum Hall effect (1995)
We study finite temperature ($T$) properties of the continuum quantum field theory of systems with a ferromagnetic ground state. A scaling theory of the $T=0$ system is discussed carefully, and its...
Quantum field theory of metallic spin glasses (1995)
Sachdev, Subir, Read, N., Oppermann, R.
We introduce an effective field theory for the vicinity of a zero temperature quantum transition between a metallic spin glass (``spin density glass'') and a metallic quantum paramagnet. Following a...
Charge and spin density wave ordering transitions in strongly correlated metals (1995)
Sachdev, Subir, Georges, Antoine
We study the quantum transition from a strongly correlated metal, with heavy fermionic quasiparticles, to a metal with commensurate charge or spin density wave order. To this end, we introduce and...
Quantum-Critical Behavior in a Two-Layer Antiferromagnet (1995)
Sandvik, Anders W., Chubukov, Andrey V., Sachdev, Subir
We analyze quantum Monte Carlo data in the vicinity of the quantum transition between a Neel state and a quantum paramagnet in a two-layer, square lattice spin 1/2 Heisenberg antiferromagnet. The...
NMR relaxation in half-integer antiferromagnetic spin chains (1994)
Nuclear relaxation in half-integer spin chains at low temperatures (T
Crossover and scaling in a nearly antiferromagnetic Fermi liquid in two dimensions (1994)
Sachdev, Subir, Chubukov, Andrey V., Sokol, Alexander
We consider two-dimensional Fermi liquids in the vicinity of a quantum transition to a phase with commensurate, antiferromagnetic long-range order. Depending upon the Fermi surface topology,...
Quantum Phase Transition in Frustrated Two-Dimensional Antiferromagnets (1994)
Chubukov, Andrey V., Sachdev, Subir, Senthil, T.
We study frustrated, two-dimensional, quantum antiferromagnets in the vicinity of a quantum transition from a non-collinear, magnetically-ordered ground state to a quantum disordered phase. The...
Sachdev, Subir, Senthil, T., Shankar, R.
Consider a $d$-dimensional antiferromagnet with a quantum disordered ground state and a gap to bosonic excitations with non-zero spin. In a finite external magnetic field, this antiferromagnet will...
Quantum Phase Transitions and Conserved Charges (1993)
The constraints on the scaling properties of conserved charge densities in the vicinity of a zero temperature ($T$), second-order quantum phase transition are studied. We introduce a generalized...
Quantum Phases of the Shraiman-Siggia Model (1993)
We examine phases of the Shraiman-Siggia model of lightly-doped, square lattice quantum antiferromagnets in a self-consistent, two-loop, interacting magnon analysis. We find magnetically-ordered and...
Polylogarithm Identities in a Conformal Field Theory in Three Dimensions (1993)
The $N=\infty$ vector $O(N)$ model is a solvable, interacting field theory in three dimensions ($D$). In a recent paper with A. Chubukov and J. Ye~\cite{self}, we have computed a universal number,...
Chubukov, Andrey V., Sachdev, Subir, Ye, Jinwu
We present the general theory of clean, two-dimensional, quantum Heisenberg antiferromagnets which are close to the zero-temperature quantum transition between ground states with and without...
Quantum Antiferromagnets in Two Dimensions (1993)
These are lectures presented at the summer course on ``Low Dimensional Quantum Field Theories for Condensed Matter Physicists'', 24 Aug. to 4 Sep. 1992, Trieste, Italy. I review recent work,...
Chubukov, Andrey V., Sachdev, Subir
We present the theory of two-dimensional, clean quantum antiferromagnets with a small, positive, zero temperature ($T$) stiffness $\rho_s$, but with the ratio $k_B T / \rho_s $ arbitrary. Universal...
Gapless Spin-Fluid Ground State in a Random Quantum Heisenberg Magnet (1992)
We examine the spin-$S$ quantum Heisenberg magnet with Gaussian-random, infinite-range exchange interactions. The quantum-disordered phase is accessed by generalizing to $SU(M)$ symmetry and studying...
A Solvable Spin-Glass of Quantum Rotors (1992)
Ye, Jinwu, Sachdev, Subir, Read, N.
We examine a model of $M$-component quantum rotors coupled by Gaussian-distributed random, infinite-range exchange interactions. A complete solution is obtained at $M=\infty$ in the spin-glass and...
Universal quantum critical dynamics of two-dimensional antiferromagnets (1992)
The universal dynamic and static properties of two dimensional antiferromagnets in the vicinity of a zero-temperature phase transition from long-range magnetic order to a quantum disordered phase are...
Frustration and order in rapidly cooled metals /--by Subir Sachdev. (1985)
Thesis (Ph. D.)--Harvard University, 1985.
Frustration and order in rapidly cooled metals--[microform] /--by Subir Sachdev. (1985)
Thesis (Ph. D.)--Harvard University, 1985.
Quantum electrodynamics in a damped cavity (1982)
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1982.
Quantum electrodynamics in a damped cavity (1982)
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1982.