题 目：Topological Semimetals: Materials prediction by First-principles Calculations
报告人: 翁红明 研究员 （中国科学院物理研究所）
时 间：2016年10月17日（星期一） 上午 9:30-11:30
地 点：李薰楼468会议室
报告摘要：
Topological Semimetals: Materials prediction by First-principles Calculations
Hongming Weng,1,2
1 Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2 Collaborative Innovation Center of Quantum Matter, Beijing 100084, China
email: hmweng@iphy.ac.cn
Topological semimetals (TSMs), characterized by Weyl/Dirac nodes in the bulk and Fermi arcs on surface, are new states of three-dimensional (3D) quantum matters, as an extension of topological classification from insulators to metals. The low energy excitation in Dirac/Weyl semimetal is the same as the Dirac/Weyl equation used for describing the massless Dirac/Weyl fermions. The Weyl fermion has certain chirality and has not been discovered since Hermann Weyl proposed it in 1929. An interesting special case where the Dirac nodes or Weyl nodes forming a closed or continuous line in momentum space is also introduced, called as Node-Line Semimetal. In this talk, I will introduce our prediction of realistic materials to realize them and their relationship as summarized in the following figure. The recent progress in finding quasiparticle of massless “new fermions” is also discussed.
Reference
[1] Z. Wang et al., PRB 85, 195320 (2012); Z. Liu et al. Science 343, 864 (2014)
[2] Z. Wang et al., PRB 88, 125427 (2013); Z. Liu et al. Nat. Mat. 13, 677 (2014)
[3] G. Xu et al., Phys. Rev. Lett. 107,186806 (2011)
[4] H. Weng et al., Phys. Rev. X 5, 011029 (2015)
[5] H. Weng et al., Phys. Rev. B 92, 045108 (2015)
[6] R. Yu, H. Weng, et al., PRL 115, 036807 (2015)
[7] H. Weng et al., MRS Bulletin 39, 849 (2014)
[8] H. Weng et al., Adv. Phys. 64, 227(2015)
[9] H. Weng et al., J. Phys.: Condens. Matter 28, 303001 (2016)
[10] H. Weng et al., Phys. Rev. B 93, 241202 (2016)
报告人简介：
翁红明，中科院物理所研究员。2005年毕业于南京大学物理学系，获博士学位，导师董锦明教授。2005年～2007年，日本东北大学金属材料研究所博士后，获2007年日本学术振兴会（JSPS）博士后奖学金。2007年-2010年，日本北陆先端大任助理教授。2010年7月回国工作。2014年获基金委优秀青年基金资助。研究领域为计算凝聚态物理。主要研究方向包括：完善和发展第一性原理计算方法及程序，非线性光学和磁光效应计算，拓扑量子态及拓扑材料计算研究等。迄今共发表SCI论文80余篇，总引用3200余次，h因子27。
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