Minimal realization of the Orbital Kondo effect in a Quantum Dot with two Leads

Abstract

We demonstrate theoretically how the Kondo effect may be observed in the transport of spinless electrons through a quantum dot. The role of conduction electron spin is played by a lead index. The Kondo effect takes place if there are two close levels in the dot populated by a single electron. For temperatures exceeding the Kondo temperature $T\gg T_K$ the conductance is maximal if the levels are exactly degenerate. However, at zero temperature the conductance is zero at the SU(2) symmetric point, but reaches the unitary limit $G=e^2/h$ for some finite value of the level splitting $Δ\eps\sim T_K$. Introducing the spin-1/2 for electrons and having two degenerate orbital levels in the dot allows to observe the SU(4) Kondo effect in a single dot coupled to two leads.

arXiv comment6 pages, 2 figures

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• A diagrammatic description of the equations of motion, current, and noise within the second-order von Neumann approach
• Transmission phase of a quantum dot: Testing the role of population switching
• The role of the indirect tunneling processes and asymmetry in couplings in orbital Kondo transport through double quantum dots
• Canyon of Current Suppression in an interacting two-level Quantum Dot
• A quantum criticality perspective on the charging of narrow quantum-dot levels
• Spin-dependent thermoelectric properties of a Kondo-correlated quantum dot with Rashba spin-orbit coupling
• Level-occupation switching of the Quantum Dot, and phase anomalies in mesoscopic interferometry
• Entanglement entropy and quantum phase transitions in quantum dots coupled to Luttinger liquid wires
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• The Functional Renormalization Group for Zero-Dimensional Quantum Systems in and out of Equilibrium
• Universal Scaling of the Quantum Conductance of an Inversion-Symmetric Interacting Model