Induced modification of the geometric phase of a qubit coupled to an XY spin chain by Dzyaloshinsky-Moriya interaction

被引：7
|
作者：
Zhang Ai-Ping [1 ,2 ,3 ]
Li Fu-Li [1 ,2 ]
机构：
[1] Xi An Jiao Tong Univ, Minist Educ, Key Lab Nonequilibrium Synth & Modulat Condensed, Xian 710049, Peoples R China
[2] Xi An Jiao Tong Univ, Dept Appl Phys, Xian 710049, Peoples R China
[3] Xian Univ Architecture & Technol, Dept Phys, Xian 710055, Peoples R China
来源：
CHINESE PHYSICS B | 2013年 / 22卷 / 03期
基金：
中国国家自然科学基金;
关键词：
geometric phase; quantum phase transition; XY spin chain; Dzyaloshinsky-Moriya interaction;
D O I：
10.1088/1674-1056/22/3/030308
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We consider a qubit symmetrically and transversely coupled to an XY spin chain with Dzyaloshinsky-Moriya (DM) interaction in the presence of a transverse magnetic field. An analytical expression for the geometric phase of the qubit is obtained in the weak coupling limit. We find that the modification of the geometrical phase induced by the spin chain environment is greatly enhanced by DM interaction in the weak coupling limit around the quantum phase transition point of the spin chain.
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页数：6
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