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Quantum thermal transport via a canonically transformed Redfield approach

ABSTRACT  


We develop a non-Markovian approach to study quantum dissipation and thermal transport in the nonequilibrium two-level system based on a canonical transformation and full-counting statistics. Specifically, we analytically study dissipative dynamics of population difference, quantum coherence, and heat current in terms of the canonical transformed Redfield approach. It demonstrates that the dynamics of both the population difference and the energy flow show monotonic decaying behaviors with the identical decay rate, whereas the quantum coherence is dominated by the oscillation showing the non-Markovian effect. Moreover, through tuning the temperature bias of thermal baths, negative differential thermal conductance is clearly exhibited beyond the weak system-bath coupling limit and Markovian approximation. The results may provide guidance for the efficient control of energy and the information transport in nanodevices.

The article were published in the American APS Journal Physical Review B under the title "Quantum thermal transport via a canonically transformed Redfield approach" (Phys. Rev. B 103, 075407 (2021)).

AUTHORS & AFFILIATIONS

Xiufeng Cao1,*, Chen Wang2, Hang Zheng3, and Dahai He1,†

  • 1Department of Physics, Xiamen University, Xiamen 361005, China

  • 2Department of Physics, Zhejiang Normal University, Jinhua 321004, China

  • 3Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, China


https://journals.aps.org/prb/abstract/10.1103/PhysRevB.103.075407