IAMS Lecture on July 17, 11:00am, Dr. Poe Lecture Hall, Dr. Ryuichi Arafune
消息來源：原分所
截止日期：2023-07-17
IAMS Lecture Announcement
中研院原分所演講公告
Title: High Energy resolved two-photon photoemission spectroscopy: How to contribute the current trend of solid state physics, such as SOI and moiré structure
Speaker: Dr. Ryuichi Arafune (Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Japan)
Time: 11:00 AM, July 17 (Monday), 2023
Place: Dr. Poe Lecture Hall, IAMS (本所浦大邦講堂臺大校園內)
Contact: Dr. Cheng-Tien Chiang 江正天博士
Abstract:
Photoelectron spectroscopy is an excellent experimental technique for directly determining the energy and momentum of electrons at solid surfaces and is widely used as a standard technique in solid-state physics. It is quite natural to think that laser technology can make a significant contribution to this analytical technique, and in fact, although still in the minority in number, laser-excited photoemission spectroscopy has become one of the core components of photoemission spectroscopy. Two-photon photoemission spectroscopy is the main stream of laser-based photoemission spectroscopy, which can provide spectroscopic data on unoccupied electronic structures with high temporal resolution, which is difficult to achieve with conventional photoemission spectroscopy.
In this talk, I will show that two-photon photoemission spectroscopy can also achieve high energy resolution (at the expense of time resolution). Especially, this method is powerful for studying spin-orbit couplings such as the Rashba effect, and modulations of electronic structure originating from moiré structures, which have recently been in the spotlight as Twistronics.
Brief Bio:
Dr. Ryuichi Arafune has been working in the field of interdisciplinary research in surface science, condensed matter physics, and nanoscience. Started his carrier in the field of the engineering of liquid crystal displays, specifically on the mechanism of the orientation of the liquid crystal molecule on the alignment film. Since he received his Ph.D., he has changed his research field to a more fundamental one including the development of a technique for surface analysis. In recent years, he has been working for inelastic vibrational excitation during the photoemission and tunneling process, spin-orbit interaction in the photoexcited state at solid surfaces, and the creation of novel two-dimensional materials including silicene.