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Title: A variational master equation approach to quantum dynamics with off-diagonal coupling in a sub-Ohmic environment
Authors: Sun, Ke-Wei
Fujihashi, Yuta
Ishizaki, Akihito
Zhao, Yang
Keywords: Quantum coherence
Issue Date: 2016
Source: Sun, K.-W., Fujihashi, Y., Ishizaki, A., & Zhao, Y. (2016). A variational master equation approach to quantum dynamics with off-diagonal coupling in a sub-Ohmic environment. The Journal of Chemical Physics, 144(20), 204106-.
Series/Report no.: The Journal of Chemical Physics
Abstract: A master equation approach based on an optimized polaron transformation is adopted for dynamics simulation with simultaneous diagonal and off-diagonal spin-boson coupling. Two types of bath spectral density functions are considered, the Ohmic and the sub-Ohmic. The off-diagonal coupling leads asymptotically to a thermal equilibrium with a nonzero population difference Pz(t → ∞) ≠ 0, which implies localization of the system, and it also plays a role in restraining coherent dynamics for the sub-Ohmic case. Since the new method can extend to the stronger coupling regime, we can investigate the coherent-incoherent transition in the sub-Ohmic environment. Relevant phase diagrams are obtained for different temperatures. It is found that the sub-Ohmic environment allows coherent dynamics at a higher temperature than the Ohmic environment.
ISSN: 0021-9606
DOI: 10.1063/1.4950888
Schools: School of Materials Science & Engineering 
Rights: © 2016 American Institute of Physics (AIP). This paper was published in The Journal of Chemical Physics and is made available as an electronic reprint (preprint) with permission of AIP. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles

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