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题名: Topological characterization of quantum phase transitions in a spin-1/2 model
作者: Feng, Xiao-Yong ;  Zhang, Guang-Ming ;  Xiang, Tao
刊名: PHYSICAL REVIEW LETTERS
出版日期: 2007
卷号: 98, 期号:8, 页码:-
关键词: BREAKING
学科分类: Physics
通讯作者: Feng, XY , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
部门归属: Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China; Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China
英文摘要: We have introduced a novel Majorana representation of S=1/2 spins using the Jordan-Wigner transformation and have shown that a generalized spin model of Kitaev defined on a brick-wall lattice is equivalent to a model of noninteracting Majorana fermions with Z(2) gauge fields without redundant degrees of freedom. The quantum phase transitions of the system at zero temperature are found to be of topological type and can be characterized by nonlocal string order parameters (SOP). In appropriate dual representations, these SOP become local order parameters and the basic concept of Landau theory of continuous phase transition can be applied.
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000244420700055
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5785
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:
Feng, Xiao-Yong,Zhang, Guang-Ming,Xiang, Tao. Topological characterization of quantum phase transitions in a spin-1/2 model[J]. PHYSICAL REVIEW LETTERS,2007,98(8):-.
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