报告人：张浩然

报告题目：能带色散关系与空间维度对狄拉克材料中光电导的影响
Effects of energy dispersion and spatial dimensionality on the optical conductivities in tilted Dirac materials

报告摘要：Spatial dimensionality of systems and energy dispersion of carriers play a central role in determining most kinds of physical properties. In this talk, we report the effects of spatial dimensionality and energy dispersion on the longitudinal optical conductivities (LOCs) in tilted Dirac materials. Both the LOCs of tilted Dirac cone in arbitrary spatial dimension and the relation between LOCs and joint density of state are analytically obtained. The dimensional dependence of LOCs on the frequency and chemical potential are presented. The characteristic features of LOCs can be taken as signatures of Lifshitz transition therein. The results are expected to be qualitatively valid for a great number of interesting tilted Dirac materials due to the underlying similarities in tilted Dirac bands.

报告简介：四川师范大学物理系、计算科学中心和固体物理研究所副教授。2012年从中国科学技术大学获得博士学位，随后进入四川师范大学工作，2017年-2018年在加拿大McGill大学访问。主要研究兴趣为理论凝聚态物理和量子场论。在理论凝聚态物理方面，近期主要关注拓扑半金属、硅烯、单层过渡金属二硫化物等拓扑材料中的新奇物理性质，包括集体激发、光电性质、输运性质和磁性相互作用等。在量子场论方面，近期主要关注与广义Kramers-Kronig关系、广义Passarino-Veltman约化方法和外尔费米子相关的理论问题。