Orbital Kondo effect in double quantum dots

TL;DR

This paper theoretically investigates the orbital Kondo effect in a double quantum dot system, analyzing conductance properties and Kondo temperature using advanced many-body techniques.

Contribution

It introduces a comprehensive theoretical analysis of the orbital Kondo effect in double quantum dots, combining scaling, slave boson, and Green function methods.

Findings

Kondo temperature evaluated from scaling and slave boson techniques

Linear conductance calculated using slave boson method

Nonlinear conductance derived via nonequilibrium Green function formalism

Abstract

Orbital Kondo effect in a system of two single-level quantum dots attached to external electron reservoirs is considered theoretically. The dots are coupled via direct hoping term and Coulomb interaction. The Kondo temperature is evaluated from the scaling approach and slave boson technique. The later method is also used to calculate linear conductance of the system. Nonlinear conductance, in turn, is calculated in terms of the nonequilibrium Green function formalism.