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Xingyu Su
PhD Student · The University of Tokyo
I am a PhD student at the University of Tokyo, working in Prof. Matsuda's laboratory. My research focuses on nonlinear optics, ultrafast light–matter interactions, and soft X-ray spectroscopy, with particular interest in semiconductor and magnetic materials. I am especially interested in developing next-generation soft X-ray nonlinear spectroscopic techniques for probing electronic and structural dynamics with element specificity.
About
Background & Experience
I am currently pursuing my PhD at the University of Tokyo, where I study ultrafast phenomena in condensed matter systems using advanced optical and soft X-ray techniques. My academic background is centered on nonlinear optics and strong-field light–matter interaction, with research spanning semiconductors, magnetic materials, and ferroelectric systems.
My recent work includes theoretical and experimental studies of soft X-ray second-harmonic generation (SXSHG), rotational anisotropy SHG, and ultrafast magnetization dynamics. I am particularly interested in understanding how electronic structure, symmetry, and orbital degrees of freedom govern nonlinear optical responses on ultrafast timescales. In addition, I work on topics related to free-electron lasers (FELs) and their applications in next-generation spectroscopy.
Research
Research Interests
Area I
Soft X-ray Nonlinear Spectroscopy
Development and application of soft X-ray second-harmonic generation and related nonlinear spectroscopic techniques to probe element-specific electronic, magnetic, and structural dynamics.
Area II
Ultrafast Light–Matter Interaction in Condensed Matter
Investigation of ultrafast phenomena in semiconductors, magnetic materials, and ferroelectrics, including photoinduced symmetry breaking, charge redistribution, and spin-orbital dynamics.
Area III
Nonlinear Optics and Strong-Field Physics
Study of nonlinear optical processes such as second-harmonic generation and high-harmonic generation, with emphasis on the connection between electronic band structure and optical response.
Publications
Selected Publications
Seeing Trajectory Without Imaging by Exploring Both Radial Momentum and Orbital Angular Momentum of Light
Rotational anisotropy soft X-ray second harmonic generation from GaAs
Turbulence-resilient detection of the rotational Doppler effect with cylindrical vector beams
Co-first AuthorFull list available on Google Scholar
News
News & Highlights
A quick overview of recent milestones, beam time, publications, and conference activities. This section is designed to make the homepage feel more current at a glance.
Recent News
Past schedule archive updated for NanoTerasu and conference activities
The 2026 archive now includes the Japanese Synchrotron Radiation Society annual meeting and NanoTerasu beam time records.
ArchiveNew paper on rotational anisotropy soft X-ray SHG from GaAs
A recent publication on rotational anisotropy soft X-ray second-harmonic generation from GaAs is listed in the selected publications section.
PublicationParticipated in Gordon Research Conference in X-ray Science
Conference participation, beam time records, and event photography were added to the schedule archive for 2025.
ConferenceSchedule
Schedule & Archive
This section keeps both upcoming plans and a browsable archive of past academic activities. Past schedules can be expanded year by year, and each archived item can include one or more images.
Upcoming
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2026
第39回日本放射光学会年会
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Get in Touch
If you are interested in my research, would like to explore collaboration opportunities, or simply want to say hello, please feel free to reach out. I typically reply within two business days.
- xingyusu@g.ecc.u-tokyo.ac.jp
- Laboratory
- Prof. Matsuda's Laboratory
The University of Tokyo - Address
- A551, Institute for Solid State Physics
Kashiwanoha 5-1-5
Kashiwa, Chiba 277-8581
Japan