[Seminar] Skyrmion crystals and their relatives in SU(3) chiral magnets

Speaker 

Dr. Yuki Amari / The University of Tokyo

March 2019: Ph.D. in Department of Physics, Tokyo University of Science
Apr. 2019 – Mar. 2020 : JSPS Research Fellow, Department of Physics , Tokyo University of Science
Aug. 2020 – Aug.2022 : Senior Researcher, Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research
June 2022 – present : Postdoctoral Researcher, Department of Physics, The University of Tokyo

Title

Skyrmion crystals and their relatives in SU(3) chiral magnets

Abstract

SU(N) magnets have been experimentally realized using ultracold atoms in an optical lattice. Theoretically, it has been proposed that spin-orbit coupling of cold atoms can be induced by applying laser beams to them [1]. Spin-I spin-orbit-coupled Bose gases in an optical lattice can be seen as SU(2I+1) magnets with a generalized Dzyaloshinskii–Moriya interaction, i.e., SU(2I+1) chiral magnets [2]. These magnets are expected to have a rich phase structure due to their large degrees of freedom. 
In this talk, we will study the ground state structure of SU(3) chiral magnets and show that they exhibit various exotic phases, for example, CP^2 Skyrmion crystal, CP^2 Skyrmionium crystal and CP^2 Helical phase. We also discuss properties of the phases using topological charge, dipole- (quadrupole-)structure factor, and configurational entropy, which is a field theoretical generalization of Shannon entropy [3].
[1] G. Juzeliunas, J. Ruseckas, and J. Dalibard, PRA 81, 053403 (2010)
[2] Y. Amari, Y. Akagi, S. B. Gudnason, M. Nitta, and Y. Shnir, PRB 106, L100406 (2022).
[3] M. Gleiser and N. Stamatopoulos, PLB 713, 304–307 (2012) .

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https://oist.zoom.us/j/95155790064

Meeting ID: 951 5579 0064