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松田巌研（D1）Su Xingyu氏、カルフォルニア大学バークレー校滞在報告

松田巌研究室のSu Xingyu氏が物性研究所海外学生派遣プログラムを利用して、米国カルフォルニア大学バークレー校に2025年9月9日から10月10日まで研究滞在してきました。このプログラムは2017年度から始まったもので、海外での共同研究を通じて、豊かな経験を持った国際的な活躍が期待できる人材を育成することを目的として、大学院生を海外の研究機関に数ヶ月間派遣しています。

Su Xingyu, I. Matsuda Group D1

Purpose

Advances in X-ray free-electron lasers (XFELs) and high-harmonic-generation (HHG) table-top lasers have enabled time-resolved soft X-ray spectroscopies for probing ultrafast electronic dynamics with element specificity. A central challenge in such experiments is determining the exact temporal overlap (“time zero”) between pump and probe pulses. This visit focused on learning mature table-top XUV techniques in time-resolved experiment to support the development of more precise pump–probe measurements at XFEL facilities.

Summary

I conducted a one-month research visit at the University of California, Berkeley, in Professor Michael Zuerch’s group, focusing on table-top high-harmonic generation extreme ultraviolet spectroscopy with attosecond time resolution. This experience deepened my understanding of ultrafast spectroscopy and provided valuable insights that will contribute to developing advanced pump–probe experiments using X-ray free-electron lasers (XFELs) in my future research.

Activity

During my one-month research visit at the University of California, Berkeley, I worked in Professor Michael Zuerch’s group to explore cutting-edge table-top high-harmonic generation (HHG) extreme ultraviolet (XUV) spectroscopy with attosecond time resolution [Fig. 1]. This experience allowed me to closely engage with state-of-the-art attosecond light sources and learn key experimental techniques, including the generation and characterization of XUV pulses, precise alignment of attosecond pump–probe systems, and analysis of time-resolved photoabsorption dynamics in solids. The intensive training not only strengthened my experimental skills but also provided valuable insights into ultrafast electron dynamics, directly enriching my ongoing research on light–matter interactions and element-resolved nonlinear optical phenomena using soft X-ray sources.

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Fig 1. The attosecond XUV spectroscopy in Michael Zuerch Lab

During my stay at the University of California, Berkeley, I also had the opportunity to visit Dr. Walter Drisdell in the Lawrence Berkeley National Laboratory (LBNL) [Fig. 2], where I learned about large-scale experimental facilities and ongoing research in materials characterization. In addition, I visited San Francisco and the Golden Gate Bridge [Fig. 3], which provided valuable cultural and personal experiences, helping me gain a broader perspective of life and research in the United States. These experiences enriched my stay and deepened my appreciation for the international research environment.

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Fig 2. The picture of Lawrence Berkeley National Laboratory and the photo with Dr. Walter Drisdell
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Fig 3. The picture of the Golden Gate Bridge

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(公開日: 2025年11月20日)

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