Quasiparticle Interference on the Surface of the Topological Insulator Bi$_2$Te$_3$ (2009)
Lee, Wei-Cheng, Wu, Congjun, Arovas, Daniel P., Zhang, Shou-Cheng
The quasiparticle interference of the spectroscopic imaging scanning tunneling microscopy has been investigated for the surface states of the large gap topological insulator Bi$_2$Te$_3$ through the...
Supersymmetric Valence Bond Solid States (2009)
Arovas, Daniel P., Hasebe, Kazuki, Qi, Xiao-Liang, Zhang, Shou-Cheng
In this work we investigate the supersymmetric version of the valence bond solid (SVBS) state. In one dimension, the SVBS states continuously interpolate between the valence bond states for integer...
Vortex quantum dynamics of two dimensional lattice bosons (2008)
Lindner, Netanel H., Auerbach, Assa, Arovas, Daniel P.
In two dimensions a vortex lattice can melt by quantum fluctuations into a non-superfluid Quantum Vortex Liquid (QVL). To determine the melting conditions, we compute the bare vortex hopping rate by...
Schwinger Bosons Approaches to Quantum Antiferromagnetism (2008)
Auerbach, Assa, Arovas, Daniel P.
These lectures review the large N Schwinger Bosons Mean Field approach to the quantum Heisenberg model. The method applies to ordered and disordered phases in all dimensions, at zero and at finite...
Stacking Faults, Bound States, and Quantum Hall Plateaus in Crystalline Graphite (2008)
Arovas, Daniel P., Guinea, Francisco
We analyze the electronic properties of a simple stacking defect in Bernal graphite. We show that a bound state forms, which disperses as $|\bfk-\bfK|^3$ in the vicinity of either of the two...
Order and Disorder in AKLT Antiferromagnets in Three Dimensions (2008)
Parameswaran, Siddharth A., Sondhi, S. L., Arovas, Daniel P.
The models constructed by Affleck, Kennedy, Lieb, and Tasaki describe a family of quantum antiferromagnets on arbitrary lattices, where the local spin S is an integer multiple M of half the lattice...
Simplex solid states of SU(N) quantum antiferromagnets (2007)
I define a set of wavefunctions for SU(N) lattice antiferromagnets, analogous to the valence bond solid states of Affleck, Kennedy, Lieb, and Tasaki (AKLT), in which the singlets are extended over...
Emergence of Spin-Half Fermion Vortices and The Vortex Metal (2007)
Lindner, Netanel, Auerbach, Assa, Arovas, Daniel P.
This paper has been withdrawn and replaced by a new version entitled "Vortex quantum dynamics of two dimensional lattice bosons" By Netanel H. Lindner, Assa Auerbach, Daniel P. Arovas, posted in...
Theory of the Three Dimensional Quantum Hall Effect in Graphite (2007)
Bernevig, B. Andrei, Hughes, Taylor L., Raghu, Srinivas, Arovas, Daniel P.
We predict the existence of a three dimensional quantum Hall effect plateau in a graphite crystal subject to a magnetic field. The plateau has a Hall conductivity quantized at $\frac{4e^2}{\hbar}...
Vortex Tunneling and Transport Theory In Two-Dimensional Bose Condensates (2005)
Auerbach, Assa, Arovas, Daniel P., Ghosh, Sankalpa
The tunneling rate t_v of a vortex between two pinning sites (of strength V separated by d) is computed using the Bogoliubov expansion of vortex wavefunctions overlap. For BCS vortices, tunneling is...
Spin and Spin-Wave Dynamics in Josephson Junctions (2004)
Nussinov, Zohar, Shnirman, Alexander, Arovas, Daniel P., Balatsky, Alexander V., Zhu, Jian-Xin
We extend the Keldysh formulation to quantum spin systems and derive exact equations of motion. This allows us to explore the dynamics of single spins and of ferromagnets when these are inserted...
Interplay between exchange interactions and charging effects in metallic grains (2004)
San-Jose, Pablo, Herrero, Carlos P., Guinea, Francisco, Arovas, Daniel P.
We study the effect of the exchange interactions in small superconducting grains near the Coulomb blockade regime. We extend the standard description of the grain in terms of a single collective...
Quantum Phase Transitions in Dissipative Tunnel Junctions (2003)
Drewes, Scott, Arovas, Daniel P., Renn, Scot
The Ueda-Guinea model of a dissipative tunnel junction is investigated. This model accounts for final state effects associated with single-electron tunneling. A quantum phase transition emerges,...
Rozhkov, A. V., Arovas, Daniel P.
We investigate the Josephson coupling between two superconductors mediated through an infinite U Anderson impurity, adapting a variational wavefunction approach which has proved successful for the...
Kinky Behavior in Josephson Junctions (1998)
Rozhkov, A. V., Arovas, Daniel P.
We analyze nonperturbatively the behavior of a Josephson junction in which two BCS superconductors are coupled through an Anderson impurity. We recover earlier perturbative results which found that a...
Phase separation in double exchange systems (1998)
Arovas, Daniel P., Gomez-Santos, Guillermo, Guinea, Francisco
Ferromagnetic systems described by the double exchange model are investigated. At temperatures close to the Curie temperature, and for a wide range of doping levels, the system is unstable toward...
Collapse of a Bose Condensate with Attractive Interactions (1998)
Freire, Jose A., Arovas, Daniel P.
We examine the Gross-Pitaevskii (GP) model for Bose-Einstein condensates in parabolic traps with attractive interactions. The decay of metastable condensates is investigated by applying the instanton...
Phase Diagram of Doped Manganates (1997)
Arovas, Daniel P., Guinea, Francisco
The phase diagram of doped manganate compounds La_{1-x}A_xMnO_3 (with divalent A) is studied. We analyze an extension of the double exchange model using the Schwinger boson formalism. Earlier work by...
Quantum Nucleation of Phase Slips in a 1d Model of a Superfluid (1997)
Freire, Jose A., Arovas, Daniel P., Levine, Herbert
We use a 1d model of a superfluid based on the Gross-Pitaevskii Lagrangian to illustrate a general numerical method designed to find quantum tunneling rates in extended bosonic systems. Specifically,...
Superconducting Vortex with Antiferromagnetic Core (1997)
Arovas, Daniel P., Berlinsky, A. J., Kallin, C., Zhang, Shou-Cheng
We show that a superconducting vortex in underdoped high T_c superconductors could have an antiferromagnetic core. This type of vortex configuration arises as a topological solution in the recently...
Non-Abelian Geometric Phases and Conductance of Spin-3/2 Holes (1997)
Arovas, Daniel P., Lyanda-Geller, Yuli
Angular momentum $J=3/2$ holes in semiconductor heterostructures are showed to accumulate nonabelian geometric phases as a consequence of their motion. We provide a general framework for analyzing...
Real Space Renormalization of the Chalker-Coddington Model (1997)
Arovas, Daniel P., Janssen, Martin, Shapiro, Boris
We study a number of hierarchical network models related to the Chalker-Coddington model of quantum percolation. Our aim is to describe the physics of the quantum Hall transition. The hierarchical...
Thermodynamics for Fractional Exclusion Statistics (1996)
Isakov, Serguei B., Arovas, Daniel P., Myrheim, Jan, Polychronakos, Alexios P.
We discuss the thermodynamics of a gas of free particles obeying Haldane's exclusion statistics, deriving low temperature and low density expansions. For gases with a constant density of states, we...
TDAE-\c60: Can a Mott insulator be a ferromagnet? (1995)
Arovas, Daniel P., Auerbach, Assa
Motivated by the structure of TDAE-\c60, we derive a multicomponent superexchange Hamiltonian for the spins and orbital (``isospin'') degrees of freedom in the Mott-insulating phase. We explore its...