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	Thermal entanglement in one-dimensional heisenberg quantum spin chains under magnetic fields
	Gong, Shou-Shu; Su, Gang
刊名	Physical review a
	2009-07-01
卷号	80期号:1页码:5
ISSN号	1050-2947
DOI	10.1103/physreva.80.012323
通讯作者	Su, gang(gsu@gucas.ac.cn)
英文摘要	The thermal pairwise entanglement (te) of the s=1/ 2 xy chain in a transverse magnetic field is exactly resolved by means of the jordan-wigner transformation in the thermodynamic limit n ->infinity. it is found that the te vanishes at a fixed point with temperature t(c)similar or equal to 0.484 3j, which is independent of the magnetic field. a thermal quantity is proposed to witness the entangled state. furthermore, the te of the s=1/ 2 antiferromagnetic-ferromagnetic (af-f) heisenberg chain is studied by the transfer-matrix renormalization-group method. the tes of the spins coupled by af and f interactions are found to behave distinctively. the vanishing temperature of the field-induced te of the spins coupled by f interactions is observed dependent on the magnetic field. the results are further confirmed and analyzed within a mean-field framework.
WOS关键词	MATRIX RENORMALIZATION-GROUP ; SYSTEMS ; CRYPTOGRAPHY ; CROSSOVER ; CHANNELS ; STATE ; S=1/2
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:000268616900069
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2396651
专题	中国科学院大学
通讯作者	Su, Gang
作者单位	Chinese Acad Sci, Grad Univ, Coll Phys Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Gong, Shou-Shu,Su, Gang. Thermal entanglement in one-dimensional heisenberg quantum spin chains under magnetic fields[J]. Physical review a,2009,80(1):5.
APA	Gong, Shou-Shu,&Su, Gang.(2009).Thermal entanglement in one-dimensional heisenberg quantum spin chains under magnetic fields.Physical review a,80(1),5.
MLA	Gong, Shou-Shu,et al."Thermal entanglement in one-dimensional heisenberg quantum spin chains under magnetic fields".Physical review a 80.1(2009):5.

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