物理科学与技术学院学术报告:Chiral transport in topological and valleytronic materials

报告题目: Chiral transport in topological and valleytronic materials

报告人:李舟  日本理化研究所

报告时间:2017 1227日 下午 15:00-16:00

报告地点:物理科技楼101

报告摘要: The 2016 Nobel prize in Physics was awarded to physicists working on topological phases. The story begins in 1980s in the search of an explanation of the quantization of Hall conductivity found by Klaus von Klitzing. Starting from the Kubo formula, Thouless and collaborators proposed a formula (later called TKNN) to calculate the quantized Hall conductivity. We use the Green's function technique and Kubo formula to study the spectral function, density of states, optical and magneto-optical conductivity in topological insulators and valleytronic materials. Quasiparticles in those materials can be described by the Dirac equation in which the gamma matrices can have Dirac representation, Weyl representation and also Majorana representation. In 1+1D and 3+1D the chirality can be defined while in 2+1D no definition of chirality can be found but the valley degree of freedom plays a similar role. We found interesting predictions which could be verified in future measurements. 

个人简介: 李舟,2004年本科毕业于南京大学物理系,2007年硕士毕业于北京大学物理系,2012年博士毕业于加拿大阿尔伯塔大学物理系。在加拿大攻读博士学位 期间曾获得Alberta Ingenuity奖学金,博士毕业时获得阿尔伯塔省政府颁发的Andrew Steward毕业纪念奖和阿尔伯塔大学毕业论文奖,同时获得由中国驻温哥华总领馆颁发的国家优秀自费留学生奖。先后在加拿大McMaster University,美国Louisiana state university从事博士后研究工作,在拓扑绝缘体、自旋电子学、谷电子学、磁光效应和极化子物理等领域均有突出的研究成果,在APS March Meeting等国际会议做邀请报告。现在是日本理化学研究所由日本政府资助的JSPS学者。

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