物理学院 School of Physics, Nanjing University

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Emergent fermions in solid state “universe”

2016年11月28日

Title: Emergent fermions in solid state “universe”

Speaker: Prof. Hong Ding

Institute of Physics, Chinese Academy of Sciences

Date: 20161129日周二下午15:00

Location: 唐仲英楼B501

 

Abstract: The universe, with a continuum space-time and Lorentz invariance, has only three possible types of fermions in theory, namely, Dirac, Weyl and Majorana fermions. In reality, only Dirac-type elementary particles have been discovered. While it is still under debate whether any elementary particle of Weyl or Majorana types exists, all three types of fermions have been proposed to exist as emergent quasiparticles in solid state “universe”, which has discrete lattices without Lorentz invariance. Its 230 space groups in lattices (or 230 different solid state “universes”) can produce even more types of emergent fermions that are not allowed in the real universe.  In this talk I will present on our experimental discoveries of Weyl fermion, “hourglass” fermion, and 3-compoment “new fermion” in solid state “universe”.

Bio: 丁洪教授,中国科学院物理所研究员,北京凝聚态国家实验室常务副主任和首席科学家。1999年获美国的斯隆奖, 2008年入选首批国家“千人计划”,2011年被选为美国物理学会会士。主要用角分辨光电子能谱研究高温超导体和拓扑材料的电子结构和物理机理,取得了一系列世界公认的重要成果。在各类科学杂志上发表了160篇学术论文,其中6篇发表在《自然》杂志,24篇发表在《物理评论快报》杂志。这些文章被SCI引用超过400次。被邀请在各种国际会议作报告40多次。

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