First-principles description for light-matter interaction in thin materials: From linear response to HHG spectrum
- Datum: 10.12.2019
- Uhrzeit: 11:00 - 12:00
- Vortragende(r): Shunsuke Yamada
- University of Tsukuba, Japan
- Ort: CFEL (Bldg. 99)
- Raum: Seminar Room IV, O1.111
- Gastgeber: Angel Rubio
- Kontakt: firstname.lastname@example.org
limiting cases of extremely thin and sufficiently thick films, we develop
approximate schemes. For the former, a 2D macroscopic description is developed:
a 2D response functions are introduced for a weak field, while time evolution
equation is derived for an intense field. For the latter, the 3D macroscopic
description coincides with the ordinary electromagnetism with the 3D bulk
response functions for a weak field, or the multiscale Maxwell-TDDFT scheme 
for a strong field, which our group developed previously. In this talk, we show
results for Si thin films and discuss the applicability of the microscopic and
Furthermore, we applied the above schemes to calculation of high-harmonic generation (HHG) in reflected and transmitted waves from the Si films exposed to intense light pulse. We discuss a thickness dependence of HHG spectrum and a difference of results between the microscopic and the multiscale schemes.
 S. Yamada et al., PRB 98, 245147 (2018).
 K. Yabana et al., PRB 85, 045134 (2012).