Unifying quantum heat transfer in a nonequilibrium spin-boson model with full counting statistics
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PhysRevA.95.023610.pdf
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Author(s)
Wang, Chen
Ren, Jie
Cao, Jianshu
Date Issued
February 2017
Journal
Physical Review A
Publisher
American Physical Society
Citation
Wang, Chen, Jie Ren, and Jianshu Cao. “Unifying Quantum Heat Transfer in a Nonequilibrium Spin-Boson Model with Full Counting Statistics.” Physical Review A 95.2 (2017): n. pag. © 2017 American Physical Society.
Version
Final published version
Abstract
To study the full counting statistics of quantum heat transfer in a driven nonequilibrium spin-boson model, we develop a generalized nonequilibrium polaron-transformed Redfield equation with an auxiliary counting field. This enables us to study the impact of qubit-bath coupling ranging from weak to strong regimes. Without external modulations, we observe maximal values of both steady-state heat flux and noise power in moderate coupling regimes, below which we find that these two transport quantities are enhanced by the finite-qubit-energy bias. With external modulations, the geometric-phase-induced heat flux shows a monotonic decrease upon increasing the qubit-bath coupling at zero qubit energy bias (without bias). While under the finite-qubit-energy bias (with bias), the geometric-phase-induced heat flux exhibits an interesting reversal behavior in the strong coupling regime. Our results unify the seemingly contradictory results in weak and strong qubit-bath coupling regimes and provide detailed dissections for the quantum fluctuation of nonequilibrium heat transfer.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
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DOI of Published Version
https://doi.org/10.1103/PhysRevA.95.023610
