Welcome to Yan S. Zha’s homepage!
I am an incoming Ph.D. student (currently a second-year M.S. student) in the Department of Condensed Matter Physicsurl at Hokkaido Universityurl (Sapporo city, Hokkaido prefecture, Japan). My research is in theoretical condensed matter physics, with a particular focus on the formation mechanisms and stability of magnetic skyrmion lattices (SkLs) in multiorbital f-electron systems. Magnetic skyrmions are topologically nontrivial magnetic textures that can form thermodynamically stable, long-range-ordered crystal phases known as skyrmion lattices. In my recent work, I have shown within a localized multiorbital model that a square-shaped skyrmion lattice (S-SkL) can be stabilized in centrosymmetric Ce-based tetragonal magnets. I am currently extending this framework to clarify how crystal-field effects, momentum-space frustrated exchange interactions, and magnetic anisotropy cooperate to stabilize or destabilize different skyrmion and other multi-Q phases. In addition to physics, I am enthusiastic about assembling and maintaining high-performance workstations for scientific computing. High-performance workstations are essential for large-scale parallel numerical simulations, and I am planning to build a small computing cluster by integrating multiple workstations to enhance computational efficiency. （2025/12/02）
NEWS
2025
2025.11.11 The preprint titled “Effects of crystal field and momentum-based frustrated exchange interactions on multiorbital square skyrmion lattice” (arXiv:2511.05896 [cond-mat.str-el]) is available on arXiv. (UTC+09:00)
2025.09.19 Gave an oral presentation titled “Effects of Crystal Field and Momentum-Based Frustrated Interaction on Multiorbital Square Skyrmion Lattice” (19aSK314-7) at the “The Physical Society of Japan 2025 Annual Meeting”url. @Hiroshima University, Higashihiroshima, Hiroshima, Japan (UTC+09:00)
2025.04.30 The article titled “Square skyrmion lattice in multiorbital $f$-electron systems” (10.1103/PhysRevB.111.165155) has been published online in Physical Review B. The version on arXiv (arXiv:2502.11765 [cond-mat.str-el]) has been updated to match the published version. (UTC+09:00)
2025.03.18 Gave an oral presentation titled “Mean-field analysis of a square skyrmion lattice in multi-orbital $f$-electron systems” (18pH2-8) at the “The Physical Society of Japan 2025 Spring Meeting Online Virtual Meeting”url. @Online (UTC+09:00)
2025.02.16–2025.02.18 Gave a poster presentation titled “Mean-field analysis of a square skyrmion lattice in multi-orbital $f$-electron systems” at “Workshop on theory of cross correlations, multipoles, and computational material design”url. @Gotemba Tokinosumika, Gotemba, Shizuoka, Japan (UTC+09:00)
2025.02.15 Created my own personal academic website using a templateurl. The setup process is based on a guide written by “一只野生钢铁侠”url on the Chinese Q&A website 知乎 (Zhihu)url. (UTC+09:00)
2024
- 2024.09.20–2024.09.23 Attended “Asymmetry Autumn School”url as a student. @National Taisetsu Youth Friendship Center, Biei, Hokkaido, Japan (UTC+09:00)