磁场中拓扑物态的量子输运

Quantum transport in topological matters under magnetic fields

拓扑物态包括拓扑绝缘体、拓扑半金属以及拓扑超导体.拓扑物态奇异的能带结构以及受拓扑保护的新奇表面态,使其具有了独特的输运性质.拓扑半金属作为物质的一种三维拓扑态具有无能隙的准粒子激发,根据导带和价带的接触类型分为外尔半金属、狄拉克半金属和节线半金属.本文以拓扑半金属为主回顾了在磁场下拓扑物态中量子输运的最新工作,在不同的磁场范围内分别给出了描述拓扑物态输运行为的主要理论.

Topological matters include topological insulator,topological semimetal and topological superconductor.The topological semimetals are three-dimensional topological states of matter with gapless electronic excitations.They are simply divided into Weyl,Dirac,and nodal-line semimetals according to the touch type of the conduction band and the valence band.Their characteristic electronic structures lead to topologically protected surface states at certain surfaces,corresponding to the novel transport properties.We review our recent works on quantum transport mainly in topological semimetals.The main theories describing the transport behavior of topological matters are given in different magnetic regions.