CV

Education

• Admitted to the Ph.D. Program in Condensed Matter Physics, Graduate School of Science, Hokkaido University. Program start: 2026.04; expected graduation: 2029.03.
• M.S. student in Condensed Matter Physics, Graduate School of Science, Hokkaido University, 2024.04–present (expected graduation: 2026.03).
• B.S. in Material Science, School of Science, Yokohama City University, 2020.04–2024.03.

Work experience

• Research Assistant (RA), Hokkaido University, 2025.02–2025.03
  • Supervisor: Prof. Dr. S. Hayami
  • Responsibilities:
    1. Conducted self-consistent mean-field calculations of skyrmion lattices.
    2. Assembled and maintained high-spec workstations for scientific computation.

Skills

• Coding
  • Mathematica
  • Python
• Languages
  • Chinese: Native proficiency
  • Japanese: Professional working proficiency (JLPT N1, 152/180; credential ID: N1A180545J)
  • English: Limited working proficiency (TOEIC Listening & Reading, total score 845)
• Sport
  • Yokohama City University Table Tennis Club, 2021.09–2024.03
  • Yokohama City University Medical Table Tennis Club, 2022.08–2024.03
• Photography

Publications

Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice

Y. S. Zha and S. Hayami, Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice (2025), arXiv:2511.05896 [cond-mat.str-el].

Square skyrmion lattice in multiorbital $f$-electron systems

Y. Zha and S. Hayami, Square skyrmion lattice in multiorbital $f$-electron systems, Phys. Rev. B \bf{111}, 165155 (2025).

Presentations

Annual workshop in FY2025, Grant-in-Aid for Transformative Research Areas (A) Asymmetric Quantum Matters

January 06, 2026

Poster presentation (Y.Z. and Satoru Hayami, 'Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice') at Nagoya Institute of Technology, Nagoya, Aichi, Japan.

The Physical Society of Japan 2025 Annual Meeting

September 16, 2025

Oral presentation (Y.Z. and Satoru Hayami, 'Effects of Crystal Field and Momentum-Based Frustrated Interaction on Multiorbital Square Skyrmion Lattice'), 19aSK314-7 at 19aSK314, Hiroshima University, Higashihiroshima, Hiroshima, Japan.

The Physical Society of Japan 2025 Spring Meeting Online Virtual Meeting

March 18, 2025

Oral presentation (Y.Z. and Satoru Hayami, 'Mean-field analysis of a square skyrmion lattice in multi-orbital $f$-electron systems'), 18pH2-8 at Online, Online.

Workshop on theory of cross correlations, multipoles, and computational material design

February 16, 2025

Poster presentation (Y.Z. and Satoru Hayami, 'Mean-field analysis of a square skyrmion lattice in multi-orbital $f$-electron systems') at Gotemba Tokinosumika, Gotemba, Shizuoka, Japan.

Notes

From Classical Heisenberg Model to Spiral Magnetism

October 17, 2024

One-Dimensional Ising Model: Phase Transition, Symmetry Breaking, and the Critical Exponent of Heat Capacity at Constant Volume

October 17, 2024

Miscellaneous Experience

• Fellowships
  • April 2026 Hokkaido University EXEX Doctoral Fellowship (JST SPRING program at Hokkaido University), Japan Science and Technology Agency (JST), 2026.04–2029.03
• Scholarships
  • JEES Scholarship, 40,000 yen/month for 2 years, Japan Educational Exchanges and Services (JEES), 2021.04–2023.03
• Tuition Fee Waivers
  • HU Tuition Fee Waiver (1/4 of the full amount), Hokkaido University, 2025.04–2025.09
  • HU Tuition Fee Waiver (full amount, maximum), Hokkaido University, 2024.10–2025.03
  • YCU Tuition Fee Reduction (1/2 of the full amount, maximum), Yokohama City University, 2023.04–2024.03
  • YCU Tuition Fee Reduction (1/2 of the full amount, maximum), Yokohama City University, 2022.04–2023.04
  • YCU Tuition Fee Reduction (1/2 of the full amount, maximum), Yokohama City University, 2021.04–2022.03
  • YCU Tuition Fee Reduction (full amount, maximum), Yokohama City University, 2020.04–2021.03