[↑Photo] Graduation ceremony of master's course @Waseda Univ. (Mar. 2023)
Sep 9, 2024 - Sep. 13, 2024
RE stays at Johannes Knolle Group [Technical University of Munich, Germany].
Aug. 8, 2024
Our new paper has been published in Physical Review B.
2024年7月18日
「固体物理」誌(アグネ技術センター)トピックス欄に日本語解説記事
「近藤格子磁性体に現れるトポロジカル磁性のスピン-電荷励起の理論」衛藤倫太郎, 望月維人
が掲載されます。
Jul 8, 2024
RE gave a poster presentation at 25th International Colloquium on Magnetic Films and Surfaces (ICMFS2024).
Poster ID: MB 2
Title: Spin-wave modes and real-space topology in the quadruple-Q magnetic hedgehog lattices
Authors: RE, Masahito Mochizuki
May 31, 2024
Our new paper has been published in Physical Review Letters.
May 17, 2024 - Nov. 13, 2024
RE stays at Alexander Mook Group [Johannes Gutenberg University Mainz, Germany]. The travel expense is funded by the JSPS Overseas Challenge Program for Young Researchers.
Highlights
Altermagnet is a new class of nonrelativistic collinear magnets with even-parity spin splittings. Using kinematic analysis, nonlinear spin-wave perturbation theory, and density-matrix renormalization group+matrix product operator-based time evolutions, we show that the spin-split upper branch of magnons in altermagets is generically unstable. This work establishes the trichotomy of magnon stability in nonrelativistic collinear magnets and illuminates possibilities of unique quantum dynamics in altermagnets.
[Review article written in Japanese]
固体物理 第59巻第7号(2024年7月号「トピックス」)pp. 13(369)-24(380).
← 固体物理誌の表紙を飾りました!
Topological magnons (Dirac/Weyl semimetal, nodal-line semimetal, topological crystalline insulator, higher-order topological insulator, ...)
Altermagnets
Perturbation theory and diagram expansion for magnons
Quantum spin liquids
Magnon-magnon interactions and their induced single- and many-particle topology
Multimagnon bound states
Quasicrystals and their approximants
Topological and chiral phonons
Topological magnetism (skyrmion crystal, hedgehog lattice, ...)
Floquet engineering