A Nonequilibrium Variational Polaron Theory to Study Quantum Heat Transport
Name
A_Nonequilibrium_Variational_Polaron_Theory_to_Stu.pdf
Description
Accepted version
Size
4.48 MB
Format
Adobe PDF
Checksum (MD5)
97300a947ddc6c63150480d4df9993c5
Author(s)
Hsieh, Chang Yu
Cao, Jianshu
Date Issued
June 2019
Journal
Journal of physical chemistry. C
Publisher
American Chemical Society (ACS)
Citation
Hsieh, Chang Yu et al. “A Nonequilibrium Variational Polaron Theory to Study Quantum Heat Transport.” Journal of physical chemistry. C, vol. 123, no. 28, 2019, pp. 17196-17204 © 2019 The Author(s)
Version
Author's final manuscript
Abstract
We propose a nonequilibrium variational polaron transformation, based on an ansatz for nonequilibrium steady state with an effective temperature, to study quantum heat transport at the nanoscale. By combining the variational polaron transformed master equation with the full counting statistics, we extended the applicability of the polaron-based framework to study nonequilibrium process beyond the super-Ohmic bath models. Previously, the polaron-based framework for quantum heat transport reduces exactly to the non-interacting blip approximation (NIBA) formalism for Ohmic bath models due to the issue of the infrared divergence associated with the full polaron transformation. The nonequilibrium variational method allows us to appropriately treat the infrared divergence in the low-frequency bath modes and explicitly include cross-bath correlation effects. These improvements provide more accurate calculation of heat current than the NIBA formalism for Ohmic bath models. We illustrate the aforementioned improvements with the nonequilibrium spin-boson model in this work and quantitatively demonstrate the cross-bath correlation, current turnover, and rectification effects in quantum heat transfer.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1021/ACS.JPCC.9B05607
