Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties

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...

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Main Authors: Zhou, Nengji, Chen, Lipeng, Xu, Dazhi, Chernyak, Vladimir, Zhao, Yang
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2015
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Online Access:https://hdl.handle.net/10356/96864
http://hdl.handle.net/10220/25570
http://journals.aps.org.ezlibproxy1.ntu.edu.sg/prb/accepted/94071O05O9d11421a6693901ecb500c2bd8dbdb4d
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-968642023-07-14T15:52:25Z Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties Zhou, Nengji Chen, Lipeng Xu, Dazhi Chernyak, Vladimir Zhao, Yang School of Materials Science & Engineering DRNTU::Science::Physics 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). Published version 2015-05-18T03:48:44Z 2019-12-06T19:35:51Z 2015-05-18T03:48:44Z 2019-12-06T19:35:51Z 2015 2015 Journal Article 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-. https://hdl.handle.net/10356/96864 http://hdl.handle.net/10220/25570 http://journals.aps.org.ezlibproxy1.ntu.edu.sg/prb/accepted/94071O05O9d11421a6693901ecb500c2bd8dbdb4d en Physical review B © 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: [http://dx.doi.org/10.1103/PhysRevB.91.195129]. 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. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Physics
spellingShingle DRNTU::Science::Physics
Zhou, Nengji
Chen, Lipeng
Xu, Dazhi
Chernyak, Vladimir
Zhao, Yang
Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
description 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).
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Zhou, Nengji
Chen, Lipeng
Xu, Dazhi
Chernyak, Vladimir
Zhao, Yang
format Article
author Zhou, Nengji
Chen, Lipeng
Xu, Dazhi
Chernyak, Vladimir
Zhao, Yang
author_sort Zhou, Nengji
title Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
title_short Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
title_full Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
title_fullStr Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
title_full_unstemmed Symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
title_sort symmetry and the critical phase of the two-bath spin-boson model : ground-state properties
publishDate 2015
url https://hdl.handle.net/10356/96864
http://hdl.handle.net/10220/25570
http://journals.aps.org.ezlibproxy1.ntu.edu.sg/prb/accepted/94071O05O9d11421a6693901ecb500c2bd8dbdb4d
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