非平衡光场调节Haldane模型相变  

Study on Non-Equlibrium Optical Field Manipulating the Phase Transition in Haldane Model

作　　者：王义翔[1] 吴亚敏[1] 

机构地区：[1]江南大学理学院,江苏无锡214211

出　　处：《江南大学学报（自然科学版）》2012年第6期731-735,共5页Joural of Jiangnan University (Natural Science Edition)　

基　　金：国家自然科学基金项目(61178032);江南大学科研启动项目(1146010241110470);中央高等院校基础科研基金项目(JUSRP11211)

摘　　要：基于处理时间周期性的Floquet定理,研究了在两种不同的Haldane模型中(包括六角蜂窝晶格及正方晶格)光场同晶格间的互作用,并给出了在参数空间中的Chern数相图。指出在两个系统中相图有差别的原因是由于破坏系统时间反演对称性的物理机制不同。从不同角度给出了实验模拟建议,得到的结果对用外光场方法调控材料的拓扑相提供了可能。Based on the Floquet theorem dealing with the time periodicity, in this paper the interaction between the optical field and lattice is studied in two different Haldane models （including the honeycomb lalLtiee and the square lattice） and the resulted phase diagrams of the Chern number in parametric space are presented. As the mechanisms that break the time-reversal symmetry are distinct, they lead to the different phase diagrams. In addition, the experimental simulations are proposed from different angles. The conclusions obtained provide the possibility of the external optical field manipulating the topological phase in real materials.

关 键 词：Haldane模型 光场 Chern数 拓扑相变 

分 类 号：O469[理学—凝聚态物理]