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Thermopower of a Kondo spin-correlated quantum dot.
TLDR
The thermopower of a Kondo-correlated gate-defined quantum dot is studied using a current heating technique and shows a clear deviation from the semiclassical Mott relation between thermopOWER and conductivity.
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Phase diagram of the commensurate two-dimensional disordered Bose-Hubbard model.
TLDR
In the vicinity of the superfluid-insulator transition of the pure system, an unexpectedly weak--almost not resolvable--sensitivity of the critical interaction to the strength of (weak) disorder is observed.
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Geometric quantum noise of spin.
TLDR
This work considers a quantum degree of freedom, moving in a dissipative environment, whose dynamics is described by a Langevin equation with quantum noise, and shows that geometric phases enter the stochastic noise terms.
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Semi-Fermionic Approach for Quantum Spin Systems ∗
We present a general derivation of semi-fermionic representation for gen- erators of SU(N) group as a bilinear combination of Fermi operators. The con- straints are fulfilled by means of imaginary…
Effects of colored noise on Landau-Zener transitions: Two- and three-level systems
We investigate the Landau-Zener transition in two- and three-level systems subject to a classical Gaussian noise. Two complementary limits of the noise being fast and slow compared to characteristic…
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Critical exponents of the superfluid-Bose-glass transition in three dimensions.
TLDR
Using Monte Carlo simulations of the disordered Bose-Hubbard model, it is demonstrated that previous work on the superfluid-to-normal-fluid transition-temperature dependence on the chemical potential (or the magnetic field, in spin systems), T_{c}∝(μ-μ_{c})^{ϕ), was misinterpreting transient behavior on approach to the fluctuation region with the genuine critical law.
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SU(3) Landau-Zener interferometry
We propose a universal approach to the Landau-Zener problem in a three-level system. The problem is formulated in terms of Gell-Mann operators which generate SU(3) algebra and map the Hamiltonian on…
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Dynamical Symmetries for Nanostructures: Implicit Symmetries in Single-Electron Transport Through Real and Artificial Molecules
1 Introduction.- 2 Hidden and Dynamical Symmetries of Atoms and Molecules.- 3 Nanostructures as Artificial Atoms and Molecules.- 4 Dynamical Symmetries in the Kondo Effect.- 5 Dynamical Symmetries in…
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Two-color Fermi-liquid theory for transport through a multilevel Kondo impurity
We consider a quantum dot with K >= 2 orbital levels occupied by two electrons connected to two electric terminals. The generic model is given by a multilevel Anderson Hamiltonian. The weak-coupling…
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Thermoelectric transport through a SU ( N ) Kondo impurity
We investigate thermoelectric transport through a SU(N) quantum impurity in the Kondo regime. The strong coupling fixed point theory is described by the local Fermi-liquid paradigm. Using Keldysh…
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