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

Abstract

We calculate the finite temperature and non-equilibrium electric current through systems described generically at low energy by a singlet and \emph{two} spin doublets for $N$ and $N\pm 1$ electrons respectively, coupled asymmetrically to two conducting leads, which allows for destructive interference in the conductance. The model is suitable for studying transport in a great variety of systems such us aromatic molecules, different geometries of quantum dots and rings with applied magnetic flux. As a consequence of the interplay between interference and Kondo effect, we find changes by several orders of magnitude in the values of the conductance and its temperature dependence as the doublet level splitting is changed by some external parameter. The differential conductance at finite bias is negative for some parameters.

4 pages, 5 figures

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• Nonequilibrium self-energies, Ng approach and heat current of a nanodevice for small bias voltage and temperature
• Nonequilibrium conductance through a benzene molecule in the Kondo regime
• Restoring the SU(4) Kondo regime in a double quantum dot system
• Relation between width of the zero-bias anomaly and Kondo temperaure in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads
• Field-induced SU(4) to SU(2) Kondo crossover in a half-filling nanotube dot: spectral and finite-temperature properties
• The $SU(4)-SU(2)$ crossover and spin filter properties of a double quantum dot nanosystem
• The dark side of benzene: interference vs. interaction
• Width of the charge-transfer peak in the SU(N) impurity Anderson model and its relevance to non-equilibrium transport
• Two-stage three-channel Kondo physics for an FePc molecule on the Au(111) surface
• Thermoelectric properties of a double quantum dot out of equilibrium in Kondo and intermediate valence regimes
• Destructive quantum interference in transport through molecules with electron-electron and electron-vibration interactions
• Two channel orbital Kondo effect in quantum dot with SO(n) symmetry
• Comment on "Conductance scaling in Kondo-correlated quantum dots: Role of level asymmetry and charging energy"
• Role of asymmetry in thermoelectric properties of a double quantum dot out of equilibrium
• Level occupation switching with density functional theory
• Transport in Single Quantum Dots: A Review from Linear Response to Nonlinear Regimes