Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 12: Skyrmions I
MA 12.7: Talk
Monday, March 18, 2024, 16:30–16:45, EB 301
Quantum Skyrmion Operator in Chiral Magnets — •Andreas Haller1, Sebastián A. Díaz2, Wolfgang Belzig2, and Thomas L. Schmidt1 — 1University of Luxembourg, Luxembourg — 2University of Konstanz, Germany
In this talk, we discuss a variational Ansatz to represent quantum skyrmions as bosonic operators. The Ansatz contains and treats independently two fundamentally different terms: the classical magnetic order, and a ``quantum cloud'' of local spin-flip excitations. Interestingly, we find two distinct regions in the single-skyrmion state diagram of the model: one where leading quantum corrections around the classical magnetic order are targeted by standard linear spin-wave (SW) theory and one that demands an interacting SW theory. Using matrix product state simulations, we verify that a two-skyrmion quantum ground state indeed satisfies bosonic exchange statistics on large distances, which paves the way toward a coarse-grained bosonic description of intriguing many-body quantum phases such as skyrmion superfluids.
Keywords: Skyrmion; Chiral Magnets; Quantum Skyrmion Operator