中国物理B ›› 2020, Vol. 29 ›› Issue (8): 80504-080504.doi: 10.1088/1674-1056/ab973b

所属专题: SPECIAL TOPIC — Phononics and phonon engineering

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A polaron theory of quantum thermal transistor in nonequilibrium three-level systems

Chen Wang(王晨), Da-Zhi Xu(徐大智)   

  1. 1 Department of Physics, Zhejiang Normal University, Jinhua 321004, China;
    2 School of Physics and Center for Quantum Technology Research, Beijing Institute of Technology, Beijing 100081, China
  • 收稿日期:2020-03-26 修回日期:2020-05-26 出版日期:2020-08-05 发布日期:2020-08-05
  • 通讯作者: Chen Wang, Da-Zhi Xu E-mail:wangchenyifang@gmail.com;dzxu@bit.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11704093 and 11705008) and Beijing Institute of Technology Research Fund Program for Young Scholars, China.

A polaron theory of quantum thermal transistor in nonequilibrium three-level systems

Chen Wang(王晨)1, Da-Zhi Xu(徐大智)2   

  1. 1 Department of Physics, Zhejiang Normal University, Jinhua 321004, China;
    2 School of Physics and Center for Quantum Technology Research, Beijing Institute of Technology, Beijing 100081, China
  • Received:2020-03-26 Revised:2020-05-26 Online:2020-08-05 Published:2020-08-05
  • Contact: Chen Wang, Da-Zhi Xu E-mail:wangchenyifang@gmail.com;dzxu@bit.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11704093 and 11705008) and Beijing Institute of Technology Research Fund Program for Young Scholars, China.

摘要:

We investigate the quantum thermal transistor effect in nonequilibrium three-level systems by applying the polaron-transformed Redfield equation combined with full counting statistics. The steady state heat currents are obtained via this unified approach over a wide region of system-bath coupling, and can be analytically reduced to the Redfield and nonequilibrium noninteracting blip approximation results in the weak and strong coupling limits, respectively. A giant heat amplification phenomenon emerges in the strong system-bath coupling limit, where transitions mediated by the middle thermal bath are found to be crucial to unravel the underlying mechanism. Moreover, the heat amplification is also exhibited with moderate coupling strength, which can be properly explained within the polaron framework.

关键词: quantum transport, open systems, nonequilibrium and irreversible thermodynamics, phonons or vibrational states in low-dimensional structures and nanoscale materials

Abstract:

We investigate the quantum thermal transistor effect in nonequilibrium three-level systems by applying the polaron-transformed Redfield equation combined with full counting statistics. The steady state heat currents are obtained via this unified approach over a wide region of system-bath coupling, and can be analytically reduced to the Redfield and nonequilibrium noninteracting blip approximation results in the weak and strong coupling limits, respectively. A giant heat amplification phenomenon emerges in the strong system-bath coupling limit, where transitions mediated by the middle thermal bath are found to be crucial to unravel the underlying mechanism. Moreover, the heat amplification is also exhibited with moderate coupling strength, which can be properly explained within the polaron framework.

Key words: quantum transport, open systems, nonequilibrium and irreversible thermodynamics, phonons or vibrational states in low-dimensional structures and nanoscale materials

中图分类号:  (Quantum transport)

  • 05.60.Gg
03.65.Yz (Decoherence; open systems; quantum statistical methods) 05.70.Ln (Nonequilibrium and irreversible thermodynamics) 63.22.-m (Phonons or vibrational states in low-dimensional structures and nanoscale materials)