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Spin-orbital entanglement and quantum phase transitions in a spin-orbital chain with SU(2)xSU(2) symmetry

被引：25
作者：
Chen, Yan
Wang, Z. D.
Li, Y. Q.
Zhang, F. C.
机构：
[1] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China
[2] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China
[3] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210008, Peoples R China
[4] Zhejiang Univ, Dept Phys, Hangzhou 310027, Peoples R China
来源：
PHYSICAL REVIEW B | 2007年 / 75卷 / 19期
关键词：
D O I：
10.1103/PhysRevB.75.195113
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Spin-orbital entanglement in quantum spin-orbital systems is quantified by a specifically reduced von Neumann entropy and is calculated for the ground state of a coupled spin-orbital chain with SU(2)xSU(2) symmetry. By analyzing the discontinuity and local extreme of the reduced entropy, we deduce a rich phase diagram describing quantum phase transitions in this system with complex correlations between multiple degrees of freedom.
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页数：5
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