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Article Dans Une Revue Physical Review B Année : 2019

Solid-liquid transition of skyrmions in a two-dimensional chiral magnet

Résumé

We study the melting of skyrmions in a two-dimensional Heisenberg chiral magnet with biaxial Dzyaloshinskii-Moriya interactions. At zero temperature, these topological excitations may form a triangular crystal with long-range positional order. We show using large-scale Monte Carlo simulations that at small finite temperature, however, the skyrmions rather form a typical two-dimensional solid, in which the positional correlations decay with distance as power laws while the orientational correlations remain finite. At higher temperature, we observe a direct transition from this two-dimensional solid to a liquid with short-range correlations. This differs from generic two-dimensional homogeneous particle systems, where a hexatic phase is sandwiched between the solid and the liquid.

Dates et versions

hal-02384024 , version 1 (28-11-2019)

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Yoshihiko Nishikawa, Koji Hukushima, Werner Krauth. Solid-liquid transition of skyrmions in a two-dimensional chiral magnet. Physical Review B, 2019, 99 (6), pp.064435. ⟨10.1103/PhysRevB.99.064435⟩. ⟨hal-02384024⟩
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