Dynamic control of quantum geometric heat flux in a nonequilibrium   spin-boson model
  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. 
Tian Chen, Xiang-Bin Wang, Jie Ren
cond-mat.mes-hall cond-mat.stat-mech quant-ph