Hahn echo and criticality in spin-chain systems

被引：0
|
作者：
X. X. Yi
H. Wang
W. Wang
机构：
[1] School of Physics and Optoelectronic Technology,
[2] Dalian University of Technology,undefined
来源：
The European Physical Journal D | 2007年 / 45卷
关键词：
03.65.Ud Entanglement and quantum nonlocality; 05.70.Jk Critical point phenomena;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
We present a theory to establish a relation between Hahn spin-echo of a spin-1/2 particle and quantum phase transitions in many-body systems. The Hahn echo is calculated and discussed at zero as well as at finite temperatures. On the example of XY model, we show that the critical points of the chain are marked by the extremal values in the Hahn echo, and can influence the Hahn echo in finite temperatures. An explanation for the relation between the echo and criticality is also presented.
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页码：355 / 362
页数：7
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