Graphene能带结构中载流子赝自旋特性描述  

The Description and Properties of the Operator of Time-Reversal Symmetry in the Energy Band of Graphene

作　　者：王党朝[1] 王益军[1] 梁昌慧[1] 张小青[1] 

机构地区：[1]咸阳师范学院物理与电子工程学院,陕西咸阳712000

出　　处：《咸阳师范学院学报》2014年第6期18-20,25,共4页Journal of Xianyang Normal University

基　　金：陕西省自然科学基金项目(2012JM1009);咸阳师范学院科研基金项目(12XSYK014;13XSYK010);咸阳师范学院教改项目(201302026)

摘　　要：graphene晶格结构中存在两种不等价的碳原子,导致在第一布里渊区中,导带和价带交界点存在不等价的K点和K'点,载流子在能谷K(K')内的运动具有时间反演对称的性质。从分析石墨烯能带结构中K能谷和K'能谷的相对论Dirac方程入手,从理论上详细计算了该时间反演对称性质的算符表示及其性质。There exist two in-equivalent carbon atoms in per unit cell in graphene, which gives rise to two conical points where the valence and conduction band crossing occurs, denoted K and K ＇ in the First Brillouin Zone, and the energy of electrons ε = ±hvF｜k｜, is linearly dependent on the wave vector k with the Fermi velocity vF= c/300（c is the velocity of light in vacuum）. When carriers approach those two energy-valleys respectively, their motion has a property of time-reversal symmetry. In this paper the operator description and its properties are given by means of analyzing the relativistic Dirac Equation in the energy band near the K and K ＇ points theoretically in details.

关 键 词：时间反演对称 反幺正算符 第一布里渊区 

分 类 号：O482[理学—固体物理]