Andreev Tunneling in Strongly Interacting Quantum Dots

TL;DR

This paper reviews resonant Andreev tunneling through strongly interacting quantum dots, highlighting the interplay of Kondo resonance and two-particle tunneling effects on transport properties.

Contribution

It provides a general expression for current and explores linear and nonlinear transport in the nonperturbative regime, revealing new effects from Kondo and two-particle tunneling.

Findings

Kondo anomaly in I-V characteristics depends on gap energy and Kondo temperature

Derived a comprehensive expression for tunneling current

Identified new effects from the interplay of Kondo resonance and two-particle tunneling

Abstract

We review recent work on resonant Andreev tunneling through a strongly interacting quantum dot connected to a normal and to a superconducting lead. We derive a general expression for the current flowing in the structure and discuss the linear and non-linear transport in the nonperturbative regime. New effects associated to the Kondo resonance combined with the two-particle tunneling arise. The Kondo anomaly in the $I-V$ characteristics depends on the relative size of the gap energy and the Kondo temperature.