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Title: Dynamics of the sub-Ohmic spin-boson model : a time-dependent variational study
Authors: Wu, Ning
Duan, Liwei
Li, Xin
Zhao, Yang
Keywords: DRNTU::Science::Physics::Atomic physics::Quantum theory
Issue Date: 2013
Source: Wu, N., Duan, L., Li, X., & Zhao, Y. (2013). Dynamics of the sub-Ohmic spin-boson model: A time-dependent variational study. The Journal of Chemical Physics, 138(8).
Series/Report no.: The journal of chemical physics
Abstract: The Dirac-Frenkel time-dependent variation is employed to probe the dynamics of the zero temperature sub-Ohmic spin-boson model with strong friction utilizing the Davydov D1 ansatz. It is shown that initial conditions of the phonon bath have considerable influence on the dynamics. Counterintuitively, even in the very strong coupling regime, quantum coherence features still manage to survive under the polarized bath initial condition, while such features are absent under the factorized bath initial condition. In addition, a coherent-incoherent transition is found at a critical coupling strength α ≈ 0.1 for s = 0.25 under the factorized bath initial condition. We quantify how faithfully our ansatz follows the Schrödinger equation, finding that the time-dependent variational approach is robust for strong dissipation and deep sub-Ohmic baths (s ≪ 1).
DOI: 10.1063/1.4792502
Rights: © 2013 American Institute of Physics. This paper was published in The Journal of Chemical Physics and is made available as an electronic reprint (preprint) with permission of American Institute of Physics. The paper can be found at the following official DOI: [].  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
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