Orbital Kondo spectroscopy in a double quantum dot system

Abstract

We calculate the nonequilibrium conductance of a system of two capacitively coupled quantum dots, each one connected to its own pair of conducting leads. The system has been used recently to perform pseudospin spectroscopy by controlling independently the voltages of the four leads. The pseudospin 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 of electrons in the system, we show how the conductance through each dot varies as the symmetry is reduced 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 fingerprint features of the SU(4) to SU(2) crossover that have not been observed so far.

5 pages, 6 figures, submitted to Phys. Rev. B

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• Analysis of low energy response and possible emergent SU(4) Kondo state in a double quantum dot
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• Impact of capacitance and tunneling asymmetries on Coulomb blockade edges and Kondo peaks in non-equilibrium transport through molecular quantum dots
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• Replicas of the Kondo peak due to electron-vibration interaction in molecular transport properties
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• Kondo behavior and conductance through $3d$ impurities in gold chains doped with oxygen
• Orbital Kondo effect in a parallel double quantum dot
• Performance of the T-matrix based master equation for Coulomb drag in double quantum dots
• Selfconsistent hybridization expansions for static properties of the Anderson impurity model
• Distinct effect of Kondo physics on crystal field splitting in electron and spin spectroscopies