Transient heat generation in a quantum dot under a step-like pulse bias

TL;DR

This paper investigates transient heat generation in a quantum dot under step-like pulse bias, revealing oscillations, heat absorption phenomena, and optimal conditions for minimal heat production in non-equilibrium phonon-electron systems.

Contribution

It introduces a detailed analysis of transient heat dynamics in quantum dots with novel findings on heat absorption and optimal operation conditions.

Findings

Oscillating heat generation after bias application

Existence of heat absorption from zero-temperature phonons

Identification of conditions for minimal heat generation

Abstract

We study the transient heat generation in a quantum dot system driven by a step-like or a square-shaped pulse bias. We find that a periodically oscillating heat generation arises after adding the sudden bias. One particularly surprising result is that there exists a heat absorption from the zero-temperature phonon subsystem. Thus the phonon population in non-equilibrium can be less than that of the equilibrium electron-phonon system. In addition, we also ascertain the optimal conditions for the operation of a quantum dot with the minimum heat generation.