Topological matter controlled by light-induced phononic symmetry switch
The recent development of nonlinear coherent spectroscopy and microscopy tools facilitates discovering and controlling topologically protected states (TPSs) by light at a THz clock rate. In this talk, I will discuss strategic advantages, with help of some recent examples from our research, of implementing the nonlinear optics approach to measure, manipulate and harvest topological photocurrent, chiral bands and phononic symmetry switches in TPSs, including discoveries of light-induced formation of Dirac and Weyl semimetals using infrared and Raman phonon coherences, ultrafast manipulation of topological surface transport and imaging of topological strip junctions at THz-nm scales.
Iowa State Univ. of Science and Technology (United States)
He is currently a full professor in the Department of Physics and Astronomy at Iowa State University and senior staff scientist in Ames laboratory of US department of Energy. He received his Ph.D. from Rice University at 2005 and joined Lawrence Berkeley National Laboratory as a postdoctoral fellow from 2005-2008. He joined Iowa State University as a faculty member since 2008. His research broadly concerns with non-equilibrium quantum dynamics and coherent control using ultrafast spectroscopy and microscopy tools. He is recipient of the NSF CAREER award and Keck foundation award for quantum microscopy. https://faculty.sites.iastate.edu/jgwang/