Prof. Xiaoqin (Elaine) Li
Physics Department，University of Texas-Austin，USA
地点：唐仲英楼 B501
时间：2018-07-17 10:00
Valley pseudospin in transition metal dichalcogenide monolayers has been proposed as an alternative information carrier. We demonstrate that valley excitons in a monolayer MoS2 can be spatially separated at room temperature when placed on top of a suitably designed metasurface. Furthermore, photons with definite chirality emitted by valley excitons are separated in momentum space, enabling far-field optical detection of valley excitons, and therefore serving as an interface between valleytronic and photonic devices. I will also review our recent coherent nonlinear experiments that have brought new insight on ultrafast exciton valley dynamics and biexcitons. Finally, I will introduce spectroscopy evidence that a regular array of quantum dots may be created in atomically thin heterostructures.
Dr. Xiaoqin (Elaine) LI obtained her Master degree in Electrical Engineering in 2002 and herPhD in physics in 2003 from the University of Michigan when she demonstrated a quantumgates based on optically driven quantum dots. She worked as a postdoctoral fellow between2003 and 2006 at JILA Colorado, where she developed a new ultrafast spectroscopic tool forinvesting electron dynamics in semiconductors known as the optical Fourier transformspectroscopy. She joined the physics department at University of Texas-Austin in 2007. Hergroup is currently exploring unique properties of metallic and hybrid nanostructures,semiconductor quantum dots and quantum wells, spin waves in micromagnetic devices using avariety of light scattering techniques and advanced nonlinear spectroscopy methods suchmultidimensional Fourier transform spectroscopy. In recent years, Dr. Li has received a numberof awards which include the Sloan fellowship, the NSF CAREER award, and the PresidentialEarly Career Award for Scientists and Engineers (PECASE).