Unusual Transport Properties with Noncommutative System–Bath Coupling Operators
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1907.11262.pdf
Description
Submitted version
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Author(s)
Duan, Chenru
Hsieh, Chang-Yu
Liu, Junjie
Wu, Jianlan
Cao, Jianshu
Date Issued
April 2020
Journal
Journal of Physical Chemistry Letters
Publisher
American Chemical Society (ACS)
Citation
Duan, Chenru, Hsieh, Chang-Yu, Liu, Junjie, Wu, Jianlan and Cao, Jianshu. 2020. "Unusual Transport Properties with Noncommutative System–Bath Coupling Operators." Journal of Physical Chemistry Letters, 11 (10).
Version
Original manuscript
Abstract
© 2020 American Chemical Society. Understanding nonequilibrium transport is crucial for controlling energy flow in nanoscale systems. We study thermal energy transfer in a generalized nonequilibrium spin-boson model (NESB) with noncommutative system-bath coupling operators and discover its unusual transport properties. Compared to the conventional NESB, the energy current is greatly enhanced by rotating the system-bath coupling operators. Constructive contribution to thermal rectification can be optimized when two sources of asymmetry, system-bath coupling strength and coupling operators, coexist. At the weak coupling and the adiabatic limit, the scaling dependence of energy current on the coupling strength and the system energy gap changes drastically when the coupling operators become noncommutative. These scaling relations can further be explained analytically by the nonequilibrium polaron-transformed Redfield equation (NE-PTRE). These novel transport properties, arising from the pure quantum effect of noncommutative coupling operators, suggest an unvisited dimension of controlling transport in nanoscale systems and should generally appear in other nonequilibrium set-ups and driven systems.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Singapore-MIT Alliance in Research and Technology (SMART)
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DOI of Published Version
https://doi.org/10.1021/acs.jpclett.0c00985
