Resonant Pair Tunneling in Double Quantum Dots

TL;DR

This paper provides exact results on non-equilibrium current fluctuations in double quantum dots, revealing a resonant tunneling of charge 2e at a critical coupling, bridging non-Fermi and Fermi liquid behaviors.

Contribution

It introduces a comprehensive analysis of non-equilibrium transport in double quantum dots, including a developed Fermi liquid approach for the 2 impurity Kondo model.

Findings

Resonant tunneling of charge 2e at critical coupling

Crossover from non-Fermi to Fermi liquid behavior

Development of a Fermi liquid framework for non-equilibrium transport

Abstract

We present exact results on the non-equilibrium current fluctuations for 2 quantum dots in series throughout a crossover from non-Fermi liquid to Fermi liquid behavior described by the 2 impurity Kondo model. The result corresponds to resonant tunneling of carriers of charge $2e$ for a critical inter-impurity coupling. At low energy scales, the result can be understood from a Fermi liquid approach that we develop and use to also study non-equilibrium transport in an alternative double dot realization of the 2 impurity Kondo model under current experimental study.