Solid-liquid transition of skyrmions in a two-dimensional chiral magnet
Solid-liquid transition of skyrmions in a two-dimensional chiral magnet
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DOI：
10.1103/physrevb.99.064435
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发表时间：
2017-10
影响因子：
3.7
通讯作者：
Yoshihiko Nishikawa;K. Hukushima;W. Krauth
中科院分区：
文献类型：
--
作者：
Yoshihiko Nishikawa;K. Hukushima;W. Krauth
我们研究了具有双轴Dzyaloshinskii-Moriya相互作用的二维Heisenberg手征磁体中Skyrmions的熔化。这些拓扑激发可以在零温下形成具有长程位序的三角形晶体。然而，我们使用大规模的蒙特卡罗模拟表明，在较小的有限温度下，Skyrmions形成了一个典型的二维固体：位置关联随距离呈幂函数衰减，而取向关联保持有限。在较高的温度下，我们观察到从这种二维固体到具有短程关联的液体的直接转变。这不同于一般的二维均匀粒子系统，在该系统中，固体和液体之间实现了六方相。
We study the melting of skyrmions in a two-dimensional Heisenberg chiral magnet with bi-axial Dzyaloshinskii--Moriya interactions. These topological excitations may form at zero temperature a triangular crystal with long-range positional order. However, we show using large-scale Monte Carlo simulations that at small finite temperature, the skyrmions rather form a typical two-dimensional solid: 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 realized between the solid and the liquid.