HiSORセミナー
Ultrafast phenomena and the related techniques: beyond pump-probe scheme
日時 2024年11月1日 （金） 15：00～16：00
場所 広島大学放射光科学研究所 2階 セミナー室
講師 黒田 健太
(広島大学大学院先進理工系科学研究科)
Over the past two decades, the development of femtosecond lasers has propelled ARPES technology into the time domain. Today, time-resolved ARPES (TR-ARPES) using pump-probe methods enables the study of ultrafast electron dynamics and the electronic structure in non-equilibrium states, providing a wealth of information that cannot be obtained from conventional ARPES experiments [1]. In this presentation, I will introduce ongoing TR-ARPES research from around the world and explain two novel TR-ARPES approaches (beyond conventional pump-probe method) that we aim to implement with spin-ARPES at HiSOR [2]. The first approach involves the measurement of ultrafast spin currents using a back-side-pump configuration [3], aiming to advance the field of ultrafast opt-spintronics. The second approach is lightwave ARPES, which leverages coherent electron motions during a optical cycle [4]. I hope that this presentation will offer a platform to share and discuss the necessary perspectives and techniques required for these developments.
[1] Fabio Boschini et al., Rev. Mod. Phys. 96, 015003 (2024).
[2] Takuma Iwata et al., Sci. Rep. 14, 127 (2024).
[3] Uwe Bovensiepen's talk at HiSOR seminar (Nov, 2022).
[4] "Petahertz electronics", Heide et al., Nature Review Physics (2024).
問合せ先 出田真一郎（放射光科学研究所）
