Stochastic thermodynamics of an electron-spin-resonance quantum dot system

TL;DR

This paper analyzes the stochastic thermodynamics of a quantum dot system driven by electron-spin resonance, revealing how quantum coherences and effective magnetic fields influence energy transport and entropy production.

Contribution

It introduces a generalized quantum master equation beyond secular approximation to account for quantum coherences in the thermodynamics of a spin-pumped quantum dot.

Findings

Effective spin precession affects energy transport.

Interaction between effective spin and magnetic field dominates entropy production.

Stationary energy and entropy balances are established.

Abstract

We present a stochastic thermodynamics analysis of an electron-spin-resonance pumped quantum dot device in the Coulomb-blocked regime, where a pure spin current is generated without an accompanying net charge current. Based on a generalized quantum master equation beyond secular approximation, quantum coherences are accounted for in terms of an effective average spin in the Floquet basis. Elegantly, this effective spin undergoes a precession about an effective magnetic field, which originates from the non-secular treatment and energy renormalization. It is shown that the interaction between effective spin and effective magnetic field may have the dominant roles to play in both energy transport and irreversible entropy production. In the stationary limit, the energy and entropy balance relations are also established based on the theory of counting statistics.