Topological Invariants of Metals and the Related Physical Effects  

作　　者：ZHOU Jian-Hui JIANG Hua NIU Qian SHI Jun-Ren 周建辉;江华;牛谦;施均仁(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190;International Center for Quantum Materials,Peking University,Beijing 100871;Department of Physics,The University of Texas,Austin,Texas 78712-0264,USA)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190 [2]International Center for Quantum Materials,Peking University,Beijing 100871 [3]Department of Physics,The University of Texas,Austin,Texas 78712-0264,USA

出　　处：《Chinese Physics Letters》2013年第2期178-181,共4页中国物理快报（英文版）

基　　金：Supported by the National Basic Research Program of China under Grant Nos 2009CB929101 and 2012CB921304.

摘　　要：The total reciprocal space magnetic flux threading through a closed Fermi surface is a topological invariant for a three-dimensional metal.For a Weyl metal,the invariant is nonzero for each of its Fermi surfaces.We show that such an invariant can be related to the magneto-valley-transport effect,in which an external magnetic field can induce a valley current.We further show that a strain field can drive an electric current,and that the effect is dictated by a second-class Chern invariant.These connections open the pathway to observe the hidden topological invariants in metallic systems.

关 键 词：INVARIANT TOPOLOGICAL FERMI 

分 类 号：O18[理学—数学]