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MA: Fachverband Magnetismus

MA 12: Skyrmions I

MA 12.7: Vortrag

Montag, 18. März 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