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

Chen Wang; Da Zhi Xu

doi:10.1088/1674-1056/ab973b

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

Chen Wang^*, Da Zhi Xu^*

^*Corresponding author for this work

School of Physics

Zhejiang Normal University

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

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.

Original language	English
Article number	080504
Journal	Chinese Physics B
Volume	29
Issue number	8
DOIs	https://doi.org/10.1088/1674-1056/ab973b
Publication status	Published - Jul 2020

Keywords

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

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10.1088/1674-1056/ab973b

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title = "A polaron theory of quantum thermal transistor in nonequilibrium three-level systems",

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.",

keywords = "nonequilibrium and irreversible thermodynamics, open systems, phonons or vibrational states in low-dimensional structures and nanoscale materials, quantum transport",

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AU - Wang, Chen

AU - Xu, Da Zhi

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N2 - 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.

AB - 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.

KW - nonequilibrium and irreversible thermodynamics

KW - open systems

KW - phonons or vibrational states in low-dimensional structures and nanoscale materials

KW - quantum transport

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SN - 1674-1056

VL - 29

JO - Chinese Physics B

JF - Chinese Physics B

IS - 8

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ER -

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

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