P. Roura-Bas

Orbital Kondo Spectroscopy in a Double Quantum Dot System

Dpto de F´isica, Centro Atomico Constituyentes,Comisio´n Nacional de Energ´ia Atomica, Buenos Aires, Argentina(Dated: January 11, 2014)We calculate the nonequilibrium conductance of a system of two capacitively coupled quantumdots, each one connected to its own pair of conducting leads. The system has been used recently toperform pseudospin spectroscopy by controlling independently the voltages of the four leads. Thepseudospin is defined by the orbital occupation of one or the other dot. Starting from the SU(4)symmetric point of spin and pseudospin degeneracy in the Kondo regime, for an odd number ofelectrons in the system, we show how the conductance through each dot varies as the symmetry isreduced to SU(2) by a pseudo-Zeeman splitting, and as bias voltages are applied to any of the dots.We analize the expected behavior of the system in general, and predict characteristic fingerprintfeatures of the SU(4) → SU(2) crossover that have not been observed so far.

Thermopower of an SU(4) Kondo resonance under an SU(2) symmetry-breaking field

We calculate the thermopower of a quantum dot described by two doublets hybridized with two degenerate bands of two conducting leads, conserving orbital (band) and spin quantum numbers, as a function of the temperature

Effects of vertex corrections on diagrammatic approximations applied to the study of transport through a quantum dot

T

Nonequilibrium transport through magnetic vibrating molecules

and a splitting

Transition between SU(4) and SU(2) Kondo effect

\delta

Kondo temperature when the Fermi level is near a step in the conduction density of states

of the quantum dot levels which breaks the SU(4) symmetry. The splitting can be regarded as a Zeeman (spin) or valley (orbital) splitting. We use the non-crossing approximation (NCA), the slave bosons in the mean-field approximation (SBMFA) and also the numerical renormalization group (NRG) for large

Nonlinear charge and energy dynamics of an adiabatically driven interacting quantum dot

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Interplay between quantum interference and Kondo effects in nonequilibrium transport through nanoscopic systems

. The model describes transport through clean C nanotubes %with weak disorder and in Si fin-type field effect transistors, under an applied magnetic field. The thermopower as a function of temperature

Replicas of the Kondo peak due to electron-vibration interaction in molecular transport properties

S(T)

Self‐consistent hybridization expansions for static properties of the Anderson impurity model

displays two dips that correspond to the energy scales given by the Kondo temperature