三维拓扑绝缘体Sb2Te3薄膜的能带结构和输运性质研究

来源 :中国物理学会2012年秋季学术会议 | 被引量 : 0次 | 上传用户:apap4444
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拓扑绝缘体是一种新的量子物态.这种物质的体能带和普通绝缘体类似,在费米能级处存在一个能隙,然而在其能隙中却具有狄拉克型的金属性表面态.此表面态由于受时间反演对称性的保护,不会被非磁性杂质所破坏[1].对于三维拓扑绝缘体,当薄膜小于一定厚度时,由于上下两个表面态的相互作用,表面态狄拉克点处会打开一个能隙.这类处于二维极限的拓扑绝缘体薄膜的能带、自旋结构和拓扑性质具有丰富的可调控性和很多新奇的拓扑量子现象,如量子反常霍尔效应、电场诱导的拓扑相变和拓扑激子凝聚现象等等.
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拓扑绝缘体是最近几年人们发现的一种新型物质形态[1],理论学家在其中预言了多种新奇的量子效应,例如马约拉纳(Majorana)费米子、量子化反常霍尔效应等,从而使这种材料吸引了大量研究者的兴趣.三维拓扑绝缘体的体能带在费米面附近具有能隙,然而却具有无能隙、自旋极化、狄拉克型的表面态.拓扑绝缘体无能隙表面态的存在是由其体能带的拓扑性质决定,因此与普通的表面态不同,不会因为表面环境的改变而消失.