Two-dimensional quantum compass model in a staggered field:some rigorous results

作     者：何培松 尤文龙 田光善 

作者机构：School of PhysicsPeking University School of Physics and TechnologySuzhou University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2011年第20卷第1期

页      面：13-22页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：Project supported by the National Science Foundation of China(Grant No.10874003) the Ministry of Science and Technology of China(Grant No.2006CB921300) Y.W.L.is supported by Start-up Funding for Young Faculty Members at Suzhou University,China(Grant Nos.Q3108907 and Q4108907) 

主　　题：multi-orbital degree of freedom quantum compass model directional order 

摘      要：We study the properties of the two-dimensional quantum compass model in a staggered field. Using the Perron- Frobenius theorem and the reflection positivity method, we rigorously determine the low energy spectrum of this model and its global ground state ψ0. Furthermore, we show that ψ0 has a directional long-range order.