The flow of electrons in materials drives much of technology
today. The ability to directly image these charge dynamics promises to
deepen our understanding of the fundamental processes involved and impact
future technology. Today, I will discuss our recent work in time resolved
photoemission electron microscopy, which allows making movies of electron
dynamics in materials with nanometer, femtosecond scale resolution. We
will discuss the imaging the motion of electrons across semiconductor
heterojunctions , separating photoexcited electrons on an ultrafast
timescale , and probing the ultrafast dynamics of carriers at nanoscale
trap sites in perovskites. Time permitting, I will talk about the unique
scientific environment on the island resort of Okinawa, where these
experiments were done.
 Nature Nanotech. 2017, 12, 36
 Science Adv. 2018, 4, eaat9722
Dr. K. M. Dani is an associate Professor at Okinawa Institute of Science and Technology, Okinawa, Japan. He obtained B.S. from California Institute of Technology, Pasadena, CA and Ph.D. in Physics from University of California at Berkeley. After working at Lawrence Berkeley National Laboratory and Los Alamos National Laboratory, he joined Femtosecond Spectroscopy Unit, Okinawa Inst. of Science and Technology.