Transport in Weyl semimetals

活动时间： 03月09日15时00分       

地            点  ： 理科二号楼B409

讲座内容：

We study the scattering and disorder effect in the WSMs. In one respect, we predict the Goos-Hänchen shift and the Imbert-Fedorov exist at the interface of two WSMs after reflection. Interestingly, we find that the IF shift actually originates from the topological effect of the system, and the topological IF shift can be utilized to characterize the Weyl semimetals, design valleytronic devices of high efficiency, and measure the Berry curvature of the system. Moreover, our studies show that the topological IF shift also influences the single impurity scattering cross-section and can further give rise to exotic transport properties of WSMs. In another respect, we study the disorder induced localization in WSMs, and find three exotic phase transitions: (i) two Weyl nodes near the Brillouin zone boundary can be annihilated by disorder scattering, resulting in a transition from a WSM to a 3D quantum anomalous Hall state; (ii) when the two Weyl nodes are well separated in momentum space, the disorder induced bulk extended states can give rise to a direct transition from a WSM to a 3D diffusive anomalous Hall metal; (iii) disorder can close the gap of trivial insulator, and leads to the emergence of two Weyl nodes, which manifests as a transition from a normal band insulator to a WSM.

主讲人介绍：

谢心澄院士，现任北京大学物理学院院长、讲席教授，中组部首批“千人计划”海外引进人才，科技部重大科学研究计划项目（973计划）首席科学家。1988年在美国马里兰大学获博士学位。曾任美国俄克拉荷马州立大学校董事会讲座教授、中科院物理所凝聚态理论与材料计算研究室主任、中科院国际量子结构中心主任、北京大学量子材料科学中心主任等职。主要从事凝聚态物理研究，研究领域包括量子霍尔效应、电荷及自旋输运、低维量子体系、关联电子系统等。共发表SCI文章200多篇，包括36篇PRL及100余篇PR系列的文章。任PRL凝聚态物理副主编。任《Solid State Communications》、《AIP Advances》等国际学术期刊编委。在国际学术会议、研讨会上作邀请报告170余次。所获奖项包括国家特聘专家（2011）、中国科学院杰出科技成就奖（2011）、中国科学十大进展（2010）、美国物理学会会士（APS Fellow）（2008）、美国俄克拉荷马州立大学Regent’s Outstanding Research Award（2005）、国家杰出青年基金海外类资助（2002）、中科院海外知名学者（2001）等。

发布时间：2017-03-07 10:33:35