Kiselev, M. N., Kikoin, K., Richert, J.
We show how the charge input signal applied to the gate electrode in a double and triple quantum dot may be converted to a pulse in the Kondo cotunneling current being a spin response of a...
Scalar and vector Keldysh models in the time domain (2009)
The exactly solvable Keldysh model of disordered electron system in a random scattering field with extremely long correlation length is converted to the time-dependent model with extremely long...
Conversion of charge input into Kondo response (2008)
Kiselev, M. N., Kikoin, K., Richert, J.
We show how the charge input signal applied to the gate electrode in double quantum dot may be converted to a pulse in the Kondo cotunneling current as a spin response of a nano-device in a strong...
Phonon-assisted and magnetic field induced Kondo tunneling in single molecular devices (2007)
We consider the Kondo tunneling induced by multiphonon emission/absorption processes in magnetic molecular complexes with low-energy singlet-triplet spin gap and show that the number of assisting...
Brünger, C., Assaad, F. F., Capponi, S., Alet, F., Aristov, D. N., Kiselev, M. N.
We consider a spin-1/2 ladder with a ferromagnetic rung coupling J_\perp and inequivalent chains. This model is obtained by a twist (\theta) deformation of the ladder and interpolates between the...
Centipede ladder at quarter filling (2007)
Aristov, D. N., Kiselev, M. N., Kikoin, K.
We study the ground state and excitation spectrum of a quasi one-dimensional nanostructure consisting of a pole and rungs oriented in the opposite directions ("centipede ladder", CL) at quarter...
Decoherence and Dephasing in Kondo Tunneling through Double Quantum Dots (2006)
Kiselev, M. N., Kikoin, K., Avishai, Y., Richert, J.
We describe the mechanism of charge-spin transformation in a double quantum dot (DQD) with even occupation, where a time dependent gate voltage v(t) is applied to one of its two valleys, whereas the...
Schröer, D. M., Hüttel, A. K., Eberl, K., Ludwig, S., Kiselev, M. N., Altshuler, B. L.
We present transport measurements of the Kondo effect in a double quantum dot charged with only one or two electrons, respectively. For the one electron case we observe a surprising quasi-periodic...
Decoherence and Dephasing in Kondo Tunneling through Double Quantum Dots (2006)
Kiselev, M. N., Kikoin, K., Avishai, Y., Richert, J.
We describe the mechanism of charge-spin transformation in a double quantum dot (DQD) with even occupation, where a time dependent gate voltage v(t) is applied to one of its two valleys, whereas the...
Kondo Shuttling in Nanoelectromechanical Single-Electron Transistor (2006)
Kiselev, M. N., Kikoin, K., Shekhter, R. I., Vinokur, V. M.
We investigate theoretically a mechanically assisted Kondo effect and electric charge shuttling in nanoelectromechanical single-electron transistor (NEM-SET). It is shown that the mechanical motion...
We present a general derivation of semi-fermionic representation for spin operators in terms of a bilinear combination of fermions in real and imaginary time formalisms. The constraint on fermionic...
Decoherence and Dephasing in Kondo Tunneling through Double Quantum Dots (2006)
Kiselev, M. N., Kikoin, K., Avishai, Y., Richert, J.
We describe the mechanism of charge-spin transformation in a double quantum dot (DQD) with even occupation, where a time dependent gate voltage v(t) is applied to one of its two valleys, whereas the...
Decoherence and Dephasing in Kondo Tunneling through Double Quantum Dots (2006)
Kiselev, M. N., Kikoin, K., Avishai, Y., Richert, J.
We describe the mechanism of charge-spin transformation in a double quantum dot (DQD) with even occupation, where a time dependent gate voltage v(t) is applied to one of its two valleys, whereas the...
Schröer, D. M., Hüttel, A. K., Eberl, K., Ludwig, S., Kiselev, M. N., Altshuler, B. L.
We present transport measurements of the Kondo effect in a double quantum dot charged with only one or two electrons, respectively. For the one-electron case, we observe a surprising quasiperiodic...
Kikoin, K., Kiselev, M. N., Wegewijs, M. R.
We investigate transport through a mononuclear transition-metal complex with strong tunnel coupling to two electrodes. The ground state of this molecule is a singlet while the first excited state is...
The Interplay of Spin and Charge Channels in Zero Dimensional Systems (2005)
We present a full fledged quantum mechanical treatment of the interplay between the charge and the spin zero-mode interactions in quantum dots. Quantum fluctuations of the spin-mode suppress the...
Kondo Lattice without Nozieres Exhaustion Effect (2005)
We discuss the properties of layered Anderson/Kondo lattices with metallic electrons confined in 2D xy planes and local spins in insulating layers forming chains in z direction. Each spin in this...
Thermopower of a Kondo-correlated quantum dot (2004)
Scheibner, R., Buhmann, H., Reuter, D., Kiselev, M. N., Molenkamp, L. W.
The thermopower of a Kondo-correlated gate-defined quantum dot is studied using a current heating technique. In the presence of spin correlations the thermopower shows a clear deviation from the...
Spin Gap in Chains with Hidden Symmetries (2004)
Kiselev, M. N., Aristov, D. N., Kikoin, K.
We investigate the formation of spin gap in one-dimensional models characterized by the groups with hidden dynamical symmetries. A family of two-parametric models of isotropic and anisotropic...
Dynamical symmetries in nanophysics (2004)
Kikoin, K., Avishai, Y., Kiselev, M. N.
The concept of dynamical symmetries is specified for quantum dots under strong Coulomb blockade. It is shown that the electron cotunneling through quantum dots may be described in terms of generators...
Ferrimagnetic mixed-spin ladders in weak and strong coupling limits (2004)
Aristov, D. N., Kiselev, M. N.
We study two similar spin ladder systems with the ferromagnetic leg coupling. First model includes two sorts of spins, s= 1/2 and s= 1, and the second model comprises only s=1/2 legs coupled by a...
Current heating of a magnetic 2DEG in HgMnTe/HgCdTe quantum wells (2003)
Gui, Y. S., Becker, C. R., Liu, J., Koenig, M., Daumer, V., Kiselev, M. N., ...
Heating caused by electrons with excess kinetic energy has been investigated in a magnetic two-dimensional electron gas, M2DEG, in HgMnTe/HgCdTe(001) quantum wells. The temperature of the Mn ions,...
Resonance Kondo Tunneling through a Double Quantum Dot at Finite Bias (2003)
Kiselev, M. N., Kikoin, K., Molenkamp, L. W.
It is shown that the resonance Kondo tunneling through a double quantum dot (DQD) with even occupation and singlet ground state may arise at a strong bias, which compensates the energy of...
Semi-fermionic approach for quantum spin systems (2002)
We present a general derivation of semi-fermionic representation for generators of SU(N) group as a bilinear combination of Fermi operators. The constraints are fulfilled by means of imaginary...
Electric Field Induced Kondo Tunneling Through Double Quantum Dot (2002)
Kiselev, M. N., Kikoin, K., Molenkamp, L. W.
It is shown that the resonance Kondo tunneling through a double quantum dot (DQD) with even occupation and singlet ground state may arise at a strong bias, which compensates the energy of...
Ginzburg-Landau functional for nearly antiferromagnetic perfect and disordered Kondo lattices (2001)
Kiselev, M. N., Kikoin, K., Oppermann, R.
Interplay between Kondo effect and trends to antiferromagnetic and spin glass ordering in perfect and disordered bipartite Kondo lattices is considered. Ginzburg-Landau equation is derived from the...
Semi-fermionic representation of SU(N) Hamiltonians (2000)
Kiselev, M. N., Feldmann, H., Oppermann, R.
We represent the generators of the SU(N) algebra as bilinear combinations of Fermi operators with imaginary chemical potential. The distribution function, consisting of a minimal set of discrete...
Schwinger-Keldysh semionic approach for quantum spin systems (2000)
We derive a path-integral Schwinger-Keldysh approach for quantum spin systems. This is achieved by means of a semionic representation of spins as fermions with imaginary chemical potential. The major...
Spin - glass transition in Kondo lattice with quenched disorder (2000)
We use the Popov-Fedotov representation of spin operators to construct an effective action for a Kondo lattice model with quenched disorder at finite temperatures. We study the competition between...
Bouis, F., Kiselev, M. N., Onufrieva, F., Pfeuty, P.
We consider a 2D electron system on a square lattice with hopping beyond nearest neighbors. The existence of the quantum critical point associated with an electronic topological transition in the...
Thermodynamics of CeNiSn at low temperatures and in weak magnetic fields (1999)
Kikoin, K. A., Kiselev, M. N., Mishchenko, A. S., De Visser, A.
Detailed experimental and theoretical studies of the low-temperature specific heat, magnetic susceptibility, thermal expansion and magnetostriction of the orthorhombic compound CeNiSn are presented....
Effective action for the Kondo lattice model. New approach for S=1/2 (1998)
In the partition function of the Kondo lattice, spin matrices are exactly replaced by bilinear combinations of Fermi operators with the purely imaginary chemical potential lambda=-i.pi.T/2 (Popov...
Spin diffusion and relaxation in three-dimensional isotropic Heisenberg antiferromagnets (1998)
A theory is proposed for kinetic effects in isotropic Heisenberg antiferromagnets at temperatures above the Neel point. A metod based on the analysis of a set of Feynman diagrams for the kinetic...
Spin liquid in 3D Kondo lattice. High temperature regime (1996)
Kikoin, K. A., Kiselev, M. N., Mishchenko, A. S.
The mechanism explaining the key role of AFM correlations in formation of the heavy fermion state is offered. It is shown that in the case of $(T^*-T_N)/T_N
Mean Field Description of Kondo-Stabilized Spin Liquid in Kondo Lattice with Heavy Fermions (1994)
Kikoin, K. A., Kiselev, M. N., Mishchenko, A. S.
Microscopic mechanism of forming the spin liquid of neutral fermions in Kondo lattices with nearly integer valence of the f-electrons in presented. It is shown that the competition between the Kondo...