Nonequilibrium transport through an interacting monitored quantum dot

TL;DR

This paper investigates how Markovian dephasing affects the Kondo effect in an interacting quantum dot, revealing robustness to charge dephasing but sensitivity to spin dephasing, with implications for quantum transport.

Contribution

It introduces a detailed analysis of dephasing effects on Kondo physics in a monitored quantum dot using the Auxiliary master equation approach.

Findings

Kondo steady-state is robust to moderate charge dephasing.

Kondo steady-state is sensitive to spin dephasing, leading to heating.

Universal scaling of non-linear conductance with dephasing-dependent Kondo scale.

Abstract

We study the interplay between strong correlations and Markovian dephasing, resulting from monitoring the charge or spin degrees of freedom of a quantum dot described by a dissipative Anderson impurity model. Using the Auxiliary master equation approach we compute the steady-state spectral function and occupation of the dot and discuss the role of dephasing on Kondo physics. Furthermore, we consider a two-lead setup which allows to compute the steady-state current and conductance. We show that the Kondo steady-state is robust to moderate charge dephasing but not to spin dephasing, which we interpret in terms of dephasing-induced heating of low-energy excitations. Finally, we show universal scaling collapse of the non-linear conductance with a dephasing-dependent Kondo scale.