2016年5月
A variational master equation approach to quantum dynamics with off-diagonal coupling in a sub-Ohmic environment
JOURNAL OF CHEMICAL PHYSICS
- ,
- ,
- ,
- 巻
- 144
- 号
- 20
- 開始ページ
- 204106
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/1.4950888
- 出版者・発行元
- AMER INST PHYSICS
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 P-z(t -> 8) not equal 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. Published by AIP Publishing.
- リンク情報
- ID情報
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- DOI : 10.1063/1.4950888
- ISSN : 0021-9606
- eISSN : 1089-7690
- ORCIDのPut Code : 47966609
- Web of Science ID : WOS:000377712700008