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	Loschmidt echo and berry phase of a quantum system coupled to an xy spin chain: proximity to a quantum phase transition
	Yuan, Zi-Gang; Zhang, Ping; Li, Shu-Shen
刊名	Physical review a
	2007
卷号	75期号:1页码:7
ISSN号	1050-2947
DOI	10.1103/physreva.75.012102
通讯作者	Yuan, zi-gang()
英文摘要	We study the loschmidt echo (le) of a coupled system consisting of a central spin and its surrounding environment described by a general xy spin-chain model. the quantum dynamics of the le is shown to be remarkably influenced by the quantum criticality of the spin chain. in particular, the decaying behavior of the le is found to be controlled by the anisotropy parameter of the spin chain. furthermore, we show that due to the coupling to the spin chain, the ground-state berry phase for the central spin becomes nonanalytical and its derivative with respect to the magnetic parameter lambda in spin chain diverges along the critical line lambda=1, which suggests an alternative measurement of the quantum criticality of the spin chain.
WOS关键词	MODEL ; ENTANGLEMENT ; DECOHERENCE ; REDUCTION
WOS研究方向	Optics ; Physics
WOS类目	Optics ; Physics, Atomic, Molecular & Chemical
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000243894100016
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2427120
专题	半导体研究所
通讯作者	Yuan, Zi-Gang
作者单位	1.Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100083, Peoples R China 2.Inst Appl Phys & Computat Math, Beijing 100088, Peoples R China
推荐引用方式 GB/T 7714	Yuan, Zi-Gang,Zhang, Ping,Li, Shu-Shen. Loschmidt echo and berry phase of a quantum system coupled to an xy spin chain: proximity to a quantum phase transition[J]. Physical review a,2007,75(1):7.
APA	Yuan, Zi-Gang,Zhang, Ping,&Li, Shu-Shen.(2007).Loschmidt echo and berry phase of a quantum system coupled to an xy spin chain: proximity to a quantum phase transition.Physical review a,75(1),7.
MLA	Yuan, Zi-Gang,et al."Loschmidt echo and berry phase of a quantum system coupled to an xy spin chain: proximity to a quantum phase transition".Physical review a 75.1(2007):7.

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