Abstract:
Electron emission and scattering are fundamental processes in electron microscopy and spectroscopy experiments. Along with rapid development of ultrafast high-resolution electron imaging techniques utilizing spatially and temporally localized electron-beams, it is critically necessary to understand the underlying mechanisms by analyzing electron emission and scattering processes at the nanoscale. For this purpose, we have performed first-principles simulations of electron dynamics using time-dependent density functional theory (TDDFT), which is formally exact and computationally efficient for studying electronically excited states. Our simulations of field emission microscopy (FEM) images of carbon nanotubes (CNTs) demonstrate that the FEM patterns are largely contributed from the localized states in the CNT tip and there is a strong correlation between theoretical and experimental results. Quite recently, major advancements have also been made in simulations of laser-assisted field emission from nanoribbons, as well as electron scattering with nanoflakes. In the talk, we give a thorough introduction of our new findings in the study of the above various topics, and demonstrate the great importance of first-principles simulation of electron dynamics in nanostructures under external fields.

Bio:
Academic Degree:
Doctor of Engineering (The University of Tokyo, March 25, 2004)
Dissertation: Ab Initio Study of Forces Acting on Nanostructures in Electric Fields
Education:
1991.09-1994.06 Xiaogan Senior High School, Hubei Province, China
1994.09-1998.06 Dept. of Materials Science and Engineering, Tsinghua University, Beijing, China
1998.09-2000.06 Dept. of Materials Science and Engineering, Graduate School, Tsinghua University, Beijing, China
2000.10-2004.03 Dept. of Materials Science, Graduate School of Engineering, The University of Tokyo, Japan
Work Experience:
2004.05-2006.03 Postdoctoral research associate, Institute for Solid State Physics, The University of Tokyo
2006.04-2008.03 CREST researcher, Japan Science and Technology Agency
2008.04-2010.03 MANA research associate, National Institute for Materials Science
2010.04-present Assistant Professor, Tokyo University of Science