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publications
A square skyrmion lattice in multi-orbital $f$-electron systems
Published in arXiv, 2025
Abstract: We report the emergence of a square-shaped skyrmion lattice in multi-orbital $f$-electron systems with easy-axis magnetic anisotropy on a centrosymmetric square lattice. By performing mean-field calculations for an effective localized model consisting of two Kramers doublets, we construct the low-temperature phase diagram in a static external magnetic field. Consequently, we find that a square-shaped skyrmion lattice with the skyrmion number of one appears in the intermediate-field region when the crystal field splitting between the two doublets is small. Furthermore, we identify another double-$Q$ state with a nonzero net scalar chirality at zero- and low-field regions, which is attributed to the help of the multi-orbital degree of freedom. Our results offer another route to search for skyrmion-hosting materials in centrosymmetric $f$-electron tetragonal systems with multi-orbital degrees of freedom, e.g., Ce-based compounds. This contrasts with conventional other $f$-electron systems hosting skyrmion lattices, such as Gd- and Eu-based compounds without orbital angular momentum.
Recommended citation: Y. Zha and S. Hayami, A square skyrmion lattice in multi-orbital $f$-electron systems (2025), arXiv:2502.11765 [cond-mat.str-el].
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talks
“Asymmetry Autumn School”
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I attended ‘Asymmetry Autumn School’ as a student. @National Taisetsu Youth Friendship Center, Biei, Hokkaido, Japan
“Workshop on theory of cross correlations, multipoles, and computational material design”
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I gave a poster presentation entitled ‘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’. @Gotemba Tokinosumika, Gotemba, Shizuoka, Japan
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Undergraduate course, University 1, Department, 2014
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