Tunable excitons and phonons in semiconductor moiré systems

报告人: Prof. Xiaoqin Elaine LI (University of Texas-Austin)

报告时间: 2023年6月27日 10:30

报告地点: 理科楼C302

报告摘要:When two atomically thin van der Waals (vdW) layers are vertically stacked together, the atomic alignment between the layers exhibits periodical variations, leading to a new type of in-plane superlattices known as the moiré superlattices. The twist angle controls the size of the moiré supercells and acts as a unique knob to control the material properties. In this talk, I will discuss how new excited states (excitons and phonons) emerge in highly tunable semiconductor moiré superlattices and the challenges one faces when trying to interpret optical measurements on these systems.

报告人简介:Xiaoqin Li received her B.S degree from Beijing Normal University in 1997 and Ph.D. in physics in 2003 from the University of Michigan. She was a postdoc fellow at JILA, Colorado from 2003-2006. She started as an assistant professor at UT-Austin in 2007 and was promoted to full professor in 2018.  Prof. Li has received several awards including the Presidential Early Career Award for Scientists and Engineers in the U. S. and a Sloan Fellowship. She was a Humboldt research fellow at the Technical University of Berlin between 2013-2015. She is a fellow of the American Physics Society and OPTICA (formerly Optical Society of America).