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Title: Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
Authors: Zhou, Nengji
Chen, Lipeng
Xu, Dazhi
Chernyak, Vladimir
Zhao, Yang
Keywords: DRNTU::Science::Physics
Issue Date: 2015
Source: Zhou, N., Chen, L., Xu, D., Chernyak, V., & Zhao, Y. (2015). Symmetry and the critical phase of the two-bath spin-boson model: ground-state properties. Physical review B, 91(19), 195129-.
Series/Report no.: Physical review B
Abstract: A generalized trial wave function termed as the "multi-D1 ansatz'' has been developed to study the ground state of the spin-boson model with simultaneous diagonal and off-diagonal coupling in the sub-Ohmic regime. Ground state properties including the energy and the spin polarization are investigated, and the results are consistent with those from the exact diagonalization and density matrix renormalization group approaches for the cases involving two oscillators and two baths described by a continuous spectral density function. Breakdown of the rotational and parity symmetries along the continuous quantum phase transition separating the localized phase from the critical phase has been uncovered. Moreover, the phase boundary is determined accurately with the corresponding symmetry parameters of the rotational and parity symmetries. A critical value of the spectral exponent s* = 0.49(1) is predicted in the weak coupling limit, which is in agreement with the mean-field prediction of 1/2, but much smaller than the earlier literature estimate of 0.75(1).
Rights: © 2015 American Physical Society. This paper was published in Physical review B and is made available as an electronic reprint (preprint) with permission of American Physical Society. 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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