Nonequilibrium Energy Transfer at Nanoscale: A Unified Theory from Weak to Strong Coupling
Author(s)Wang, Chen; Ren, Jie; Cao, Jianshu
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Unraveling the microscopic mechanism of quantum energy transfer across two-level systems provides crucial insights to the optimal design and potential applications of low-dimensional nanodevices. Here, we study the non-equilibrium spin-boson model as a minimal prototype and develop a fluctuation-decoupled quantum master equation approach that is valid ranging from the weak to the strong system-bath coupling regime. The exact expression of energy flux is analytically established, which dissects the energy transfer as multiple boson processes with even and odd parity. Our analysis provides a unified interpretation of several observations, including coherence-enhanced heat flux and negative differential thermal conductance. The results will have broad implications for the fine control of energy transfer in nano-structural devices.
DepartmentMassachusetts Institute of Technology. Department of Chemistry
Nature Publishing Group
Wang, Chen, Jie Ren, and Jianshu Cao. “Nonequilibrium Energy Transfer at Nanoscale: A Unified Theory from Weak to Strong Coupling.” Scientific Reports 5 (July 8, 2015): 11787.
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