Prof. Jingbo Qi
School of Electronic Science and Engineering at University of Electronic Science and Technology of China
地点：唐仲英楼 A213
时间：2019-04-25 10:00
A crucial element of the ultrafast coherent control is the generation of light or electromagnetic wave pulses with tunable polarization in a broad spectral range. Here, we discover strong chiral broadband terahertz emission from the topological Weyl semimetals and demonstrate unprecedented manipulation over its polarization and chirality on femtosecond timescale [1]. Such controllability is achieved via polarization-dependent, colossal ultrafast photocurrents generated using the circular and/or linear photogalvanic effect. Our finding opens a new route to realize chiral photon sources using quantum materials.[1] Y. Gao, J. Qi*et al., arXiv:1901.00986 (2019).
Jingbo Qi (齐静波), a professor in the School of Electronic Science and Engineering at University of Electronic Science and Technology of China. He got his Ph.D. from Vanderbilt University (USA). He was ever a postdoctoral associate in the National High Magnetic Field Laboratory and Los Alamos National Laboratory, respectively. His main research interest focuses on using the ultrafast optical spectroscopy and terahertz spectroscopy to study the dynamical properties in various systems such as topological materials and strongly correlated materials.