No Spin-Localization Phase Transition in the Spin-Boson Model without Local Field

CORC > 武汉物理与数学研究所 > 中国科学院武汉物理与数学研究所 > 原子分子光物理研究部

	No Spin-Localization Phase Transition in the Spin-Boson Model without Local Field
	Liu Tao 1,2; Feng Mang 1; Li Lei 1,2; Yang Wan-Li 1; Wang Ke-Lin 3
刊名	COMMUNICATIONS IN THEORETICAL PHYSICS
	2013-12-01
卷号	60 期号:6 页码:637-641
关键词	spin-boson model localization phase transition parity breaking
英文摘要	We explore the spin-boson model in a special case, i.e., with zero local field. In contrast to previous studies, we find no possibility for quantum phase transition (QPT) happening between the localized and delocalized phases, and the behavior of the model can be fully characterized by the even or odd parity as well as the parity breaking, instead of the QPT, owned by the ground state of the system. The parity breaking mentioned in our case is completely different from the spontaneously broken symmetry relevant to the conventionally defined QPT in previous studies. Our analytical treatment about the eigensolution of the ground state of the model presents for the first time a rigorous proof of no-degeneracy for the ground state of the model, which is independent of the bath type, the degrees of freedom of the bath and the calculation precision. We argue that the QPT mentioned previously appears due to incorrect employment of the ground state of the model and/or unreasonable treatment of the infrared divergence existing in the spectral functions for Ohmic and sub-Ohmic dissipations.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
收录类别	SCI
语种	英语
WOS记录号	WOS:000330882300001
公开日期	2016-05-09
内容类型	期刊论文
源URL	[http://ir.wipm.ac.cn/handle/112942/875]
专题	武汉物理与数学研究所_原子分子光物理研究部
作者单位	1.Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China 2.Southwest Univ Sci & Technol, Sch Sci, Mianyang 621010, Peoples R China 3.Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Liu Tao,Feng Mang,Li Lei,et al. No Spin-Localization Phase Transition in the Spin-Boson Model without Local Field[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2013,60(6):637-641.
APA	Liu Tao,Feng Mang,Li Lei,Yang Wan-Li,&Wang Ke-Lin.(2013).No Spin-Localization Phase Transition in the Spin-Boson Model without Local Field.COMMUNICATIONS IN THEORETICAL PHYSICS,60(6),637-641.
MLA	Liu Tao,et al."No Spin-Localization Phase Transition in the Spin-Boson Model without Local Field".COMMUNICATIONS IN THEORETICAL PHYSICS 60.6(2013):637-641.