学术报告（10月7日）

主持人：张笑 教授

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报告摘要：
Weyl semimetals are new states of quantum matter which host Weyl nodes near the Fermi level in bulk bands and novel Fermi arcs in surface bands. Recently Weyl semimetals are discovered in noncentrosymmetric TaAs-class materials hosting 24 Weyl nodes which are away from the Fermi level and mix with trivial bands. It is desired to find ideal Weyl semimetals whose Weyl nodes exactly locate at the Fermi level protected by symmetry, like in graphene. Here, based on first-principles calculations and symmetry analysis, we demonstrate that mercury chalcogenide (e.g. HgTe) and half-Heusler (e.g. LaPtBi) compounds host 8 ideal Weyl nodes exactly at the Fermi level protected by symmetry under a broad range of the in-plane strain. Such ideal Weyl semimetals could maximize the potential for novel transport phenomena induced by the chiral anomaly. Moreover, these materials provide a perfect playground to study the interplay between ideal Weyl fermions and superconductivity and/or magnetism.
 
报告人简介：
张海军博士于2015起任南京大学beat365中国唯一官方网站教授, 博士毕业于中科院物理研究所, 于美国斯坦福大学物理系任博士后,曾获得2011年香港求是基金会‘杰出科技成就集体奖’ 并入选2015年 第十一批国家’青年海外高层次人才项目’。 代表性学术成果为理论预言了最典型的一类拓扑绝缘体，Bi2Se3, Bi2Te3 and Sb2Te3。