Entanglement in the 1D extended anisotropic Heisenberg model

被引：10
|
作者：
Plekhanov, E. [1 ]
Avella, A. [1 ]
Mancini, F. [1 ]
机构：
[1] Univ Salerno, Dipartmento Fis ER Caianiello, Unita CNISM Salerno, I-84081 Baronissi, Italy
来源：
PHYSICA B-CONDENSED MATTER | 2008年 / 403卷 / 5-9期
关键词：
entanglement; 1D spin systems; Heisenberg model; Lanczos;
D O I：
10.1016/j.physb.2007.10.127
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We present a study of entanglement in the case of the I D extended anisotropic Heisenberg model. We investigate two quantum phase transitions (QPTs) within the previously found ergodicity phase diagram [E. Plekhanov, A. Avella, F. Mancini, Phys. Rev. B 74 (2006) 115120]. Our calculations are done by means of the numerically exact Lanczos method at T = 0, followed by a finite-size scaling. As a measure of entanglement we use the concurrence for two spins out of the system. We conclude from our studies that these QPTs are accompanied by a qualitative entanglement change. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1282 / 1283
页数：2
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