Dynamic control of quantum geometric heat flux in a nonequilibrium spin-boson model

TL;DR

This paper investigates the quantum geometric heat flux in a nonequilibrium spin-boson model, revealing conditions for its existence and demonstrating dynamic control and energy transfer mechanisms in strong coupling regimes.

Contribution

It introduces a nonperturbative approach to analyze quantum geometric heat flux, highlighting effects unique to strong system-bath coupling regimes.

Findings

Nonzero geometric heat flux occurs only in nondegenerate systems.

Dynamic control of heat flux is achievable through modulation of system parameters.

Quantum energy transfer mechanisms are identified in strong coupling regimes.

Abstract

We study the quantum geometric heat flux in the nonequilibrium spin-boson model. By adopting the noninteracting-blip approximation that is able to accommodate the strong system-bath coupling, we show that there exists a nonzero geometric heat flux only when the two-level system is nondegenerate. Moreover, the pumping, no pumping, and dynamic control of geometric heat flux are discussed in detail, compared to the results with Redfield weak-coupling approximation. In particular, the geometric energy transfer induced by modulation of two system-bath couplings is identified, which is exclusive to quantum transport in the strong system-bath coupling regime.