报告人：黄兵

        中国工程物理研究院北京计算科学研究中心特聘研究员

邀请人：崔彬 博士

报告时间：2018-06-28 （周四） 下午 3:00

报告地点：知新楼C座1111报告厅

Abstract:

Topological semimetals (TSMs) have attracted great attentions in condensed matter physics. However, the search of ideal TSMs that only the desired quasi-particles can exist around the Fermi level is still a big challenging. Taking triple-point TSM as an example, we demonstrate that the band crossing between antibonding s orbtial and bonding p orbital along a C3v symmetry can realize an ideal triple-point band crossing. By considering the general band formation model around conduction band minimum and valence band maximum in an ionic semiconductor, we have successfully targeted the ideal triple-point TSMs in NaCu3Te2 family compounds. Thanks to the ideal band crossing properties, we can further analysis the evolution of Fermi arc from Dirac to triple-point to Weyl semimetals for the first time. Recently, we have also extend the band crossing model from 0D point or 1D line to a 2D sphere in a 3D crystal, which may form a Dirac-nodal-sphere (DNS) system with unusual electronic properties. We also suggested several material candidates to realize such DNS states.

报告人简介：

黄兵，中国工程物理研究院北京计算科学研究中心特聘研究员。2005年本科毕业于吉林大学物理学院，2010年博士毕业于清华大学物理系（段文晖/顾秉林院士研究组）。2010-2015年期间曾在美国再生能源国家实验室(博士后)，橡树岭国家实验室（研究助理）和犹他大学进行（研究助理教授）学术研究。黄兵长期从事半导体电子结构方面的理论研究，围绕半导体物理中的基础科学问题，在对半导体的掺杂效应、合金调控、半导体自旋和电子态调控等方面进行了系统和深入的研究。至今已在Phys. Rev. Lett.(11)、Phys. Rev. X(2)等期刊发表论文60余篇，被引用3000次，H因子29。2018年任中央军委"国防973"计划首席科学家。