Transient thermoelectricity in a vibrating quantum dot in Kondo regime

TL;DR

This paper studies how the thermopower in a vibrating quantum dot evolves over time when it enters the Kondo regime, revealing potential methods to determine key physical parameters like the Kondo temperature and electron-phonon coupling strength.

Contribution

It introduces a time-dependent analysis of thermopower in a vibrating quantum dot within the Kondo regime using the non-crossing approximation and linear response theory.

Findings

Inverse decay time of thermopower relates to Kondo temperature.

Thermopower behavior varies with temperature and electron-phonon coupling.

Potential new method for characterizing quantum dot parameters.

Abstract

We investigate the time evolution of the thermopower in a vibrating quantum dot suddenly shifted into the Kondo regime via a gate voltage by adopting the time-dependent non-crossing approximation and linear response Onsager relations. Behaviour of the instantaneous thermopower is studied for a range of temperatures both in zero and strong electron-phonon coupling. We argue that inverse of the saturation value of decay time of thermopower to its steady state value might be an alternative tool in determination of the Kondo temperature and the value of the electron-phonon coupling strength.