The weekly seminar series organized by CNT and the Molecular Engineering and Sciences Institute provides a forum for bringing national and international leaders in nanoscale science and technology to campus, and for graduate students enrolled in our Dual Ph.D. program in Nanotechnology to present their research.
All seminars are held on Tuesdays from 2:30 to 3:20 PM in Johnson Hall Room 102 (North end of building and across from MolE).
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Optical Probing Novel 2D Electronic Systems
Sanfeng Wu, University of Washington - Dept. of Physics
Asst. Prof. Xiaodong Xu, Dept. of Physics
Novel 2D electronic systems have drawn much attention recently in the field of condensed matter physics. These systems, such as graphene and monolayer of Group-VI dichalcogenides, exhibit many new physical concepts and phenomena. In this talk, I will focus on both theoretical prediction and/or experimental demonstration of several novel effects in these 2D materials using optical means. These effects include giant nonlinear optical response of graphene, optical generation and electrical control of excitons and their polarizations in atomically-thin semiconductors. Beyond these interesting phenomena, an important concept I will show here is that valley, the energy extrema in momentum space, can be treated as a new degree of freedom of electron besides charge and spin, and therefore may open a door for next generation of electronics, so called valleytronics.
Copyright © 2012 The Center for Nanotechnology at the University of Washington