报告题目：FIRST-PRINCIPLES SIMULATIONS OF MULTIELECTRON DYNAMICS IN STRONG LASER FIELDS
报告人：Prof. Kenichi L. Ishikawa
主持人：吴健 教授
时间：10月8日（周一）上午10:00
地点：理科大楼A814会议室
主办单位：精密光谱科学与技术国家重点实验室
报告摘要：
Advances in ultrashort intense laser techniques have paved the way to investigate strong-field and attosecond physics. In particular, high-harmonic generation (HHG) from gas-phase atoms and molecules has led to successful applications such as attosecond pulse generation and coherent keV x-ray sources as well as powerful means to observe and manipulate ultrafast electron dynamics. Moreover, Solid-state materials have recently emerged as a new stage of strong-field and attosecond physics. For further advance in attosecond laser technology, it is essential to develop first-principles numerical approaches for many-electron dynamics.
We have recently developed and implemented various ab initio time-dependent methods including the time-dependent complete-active-space self-consistent field (TD-CASSCF) method [1, 2], the time-dependent occupation restricted multiple active space (TD-ORMAS) method [3], the gauge-invariant time-dependent configuration interaction singles (TD-CIS) [4] method, and the time-dependent optimized coupled-cluster (TD-OCC) method [5]. Further stepping forward, we have recently formulated the fully general time-dependent multiconfiguration self-consistent-field method to describe the dynamics of a system consisting of arbitrary different kinds and numbers of interacting fermions and bosons [6].
We have also been actively developing various theoretical methods to simulate HHG in solids. As a first step, we numerically solve the time-dependent Schrödinger equation, within independent-electron approximation. Based on the results, we propose a solid-state and momentum-space counterpart of the familiar three-step model [7]. Furthermore, using the time-dependent Hartree-Fock simulations, we have revealed the electron-hole interaction effects [8]. Our studies provide a unified basis to understand HHG from solid-state materials and gaseous media.
This work was supported by MEXT, JST, and JSPS.
REFERENCES
T. Sato and K. L. Ishikawa, Phys. Rev. A 88, 023402 (2013).
T. Sato, K. L. Ishikawa, et al., Phys. Rev. A 94, 023405 (2016).
T. Sato and K. L. Ishikawa, Phys. Rev. A 91, 023417 (2015).
T. Sato, T. Teramura, and K. L. Ishikawa, Appl. Sci. 8, 433 (2018).
T. Sato, H. Pathak, Y. Orimo, K. L. Ishikawa, J. Chem. Phys. 148, 051101 (2018).
R. Anzaki, T. Sato, and K. L. Ishikawa, Phys. Chem. Chem. Phys. 19, 22008 (2017).
T. Ikemachi, Y. Shinohara, T. Sato, J. Yumoto, M. Kuwata-Gonokami, and K. L. Ishikawa, Phys. Rev. A 95, 043416 (2017).
T. Ikemachi, Y. Shinohara, T. Sato, J. Yumoto, M. Kuwata-Gonokami, and K. L. Ishikawa, Phys. Rev. A 98, 023415 (2018).
报告人简介:
Kenichi L. Ishikawa received the Ph.D. (Dr.rer.nat.) degree from RWTH Aachen University, Aachen, Germany, in 1998. He is currently a Professor at Department of Nuclear Engineering and Management, Graduate School of Engineering, the University of Tokyo, Tokyo, Japan. He was a Postdoctoral Researcher at CEA-Saclay, Gif-sur-Yvette, France, from 1998 to 2000, a Special Postdoctoral Researcher at RIKEN, Wako, Japan, from 2000 to 2002, an Associate Professor at the University of Tokyo, Tokyo, Japan, from 2002 to 2008, a Senior Researcher at RIKEN, Wako, Japan, from 2008 to 2009, and a Project Associate Professor at the University of Tokyo, Tokyo, Japan, from 2009 to 2014. His research interests include attosecond science, strong-field physics, and ultrafast intense laser science.