Dynamics of the sub-Ohmic spin-boson model: A time-dependent variational study
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798 (Singapore)
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 D{sub 1} 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 {alpha} Almost-Equal-To 0.1 for s= 0.25 under the factorized bath initial condition. We quantify how faithfully our ansatz follows the Schroedinger equation, finding that the time-dependent variational approach is robust for strong dissipation and deep sub-Ohmic baths (s Much-Less-Than 1).
- OSTI ID:
- 22105390
- Journal Information:
- Journal of Chemical Physics, Vol. 138, Issue 8; Other Information: (c) 2013 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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