Holographic topological semimetals and topological invariants

admin   2018-09-01 22:35:52   3686

报告题目:Holographic topological semimetals and topological invariants
报告时间:2018-09-07 15:30 (星期五)
报告地点:long8唯一官方网站新校区理学院32楼218
报告人:孙雅文教授(中国科学院大学)

报告摘要:Topological states of matter have beena research focus in condensed matter physics for the past decade. I will introducea framework in holography to generate gapless topological semimetal states. Asexplicit examples, we introduce the holographic model of Weyl semimetals andtopological nodal-line semimetals. In each of these systems, there exists aquantum phase transition between the topologically trivial semimetal states andthe topologically nontrivial Weyl/nodal-line semimetal states. Evidenceincluding anomalous transport properties and "ARPES" calculations aswell as predictions for possible new transport properties, including thepresence of Hall viscosity associated with the mixed gauge gravitationalanomaly, will be discussed. Finally we will specially focus on the calculationof nontrivial topological invariants from the dual fermion Green functions. Thissuggests that at strong coupling we could still have a physical system with theessential properties of the weakly coupled topology semimetals.   


报告人简历:孙雅文,本科毕业于中国科学技术大学,2010年于中科院理论物理研究所取得物理博士学位。先后在莱顿大学、西班牙国家科学院理论物理所从事博士后研究工作,2015-06~2017-09西班牙国家科学院理论物理所玛丽居里学者。现就职于中国科学院大学。研究领域为高能理论物理,引力,弦论,黑洞物理,引力/规范对偶。


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