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题名: UNIVERSALITY OF DISSIPATIVE 2-STATE SYSTEMS
作者: HONG, C ;  LU, Y
刊名: PHYSICAL REVIEW B
出版日期: 1992
卷号: 45, 期号:23, 页码:13753-13756
关键词: SQUEEZED-STATE APPROACH ;  TUNNELING SYSTEMS ;  INSTANTON APPROACH ;  ZERO TEMPERATURE ;  MODEL ;  DYNAMICS ;  PHONONS ;  TRANSITION ;  JUNCTIONS
学科分类: Physics
通讯作者: HONG, C , INT CTR THEORET PHYS,STRADA COSTIERA 11,I-34014 TRIESTE,ITALY.
部门归属: TONG JI UNIV,POHL INST SOLID STATE PHYS,SHANGHAI 200092,PEOPLES R CHINA; CHINESE ACAD SCI,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要: The static properties of a dissipative two-state system are studied by perturbation, mapping to the quantum sine-Gordon model, and a variational approach. We find that its properties at zero temperature depend not only on the spectral density J(omega) is similar to SIGMA(l)g(l)2-delta(omega-omega(l)), but also on the explicit form of the coupling strength g(l) is similar omega(l)lambda (omega(l) is the phonon frequency). For weak coupling (lambda greater-than-or equal-to 1), the effect of displacement of the phonon state is dominant; while for strong coupling (lambda greater-than-or-equal-to 1), one must take account of both displacement and deformation. Displaced squeezed states are proposed as ground states of the bath under strong coupling, and we show that the localization transition of the Ohmic dissipation occurs at alpha(c) = 3 - 2-lambda instead of alpha(c) = 1 as for the weak-coupling case.
收录类别: SCI
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12155
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
HONG, C,LU, Y. UNIVERSALITY OF DISSIPATIVE 2-STATE SYSTEMS[J]. PHYSICAL REVIEW B,1992,45(23):13753-13756.
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