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arXiv 2212.09698cond-mat.mtrl-scicond-mat.mes-hallcond-mat.stat-mech
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二维材料中的多重子相互作用和统计

Multi-Meron Interactions and Statistics in Two-Dimensional Materials

Xiaobo Lu, Linghan Zhu, Li Yang

摘要:

磁重子是二维磁体中自旋拓扑织构的一种基本类型,它携带半整数拓扑荷,并与其对立面形成一对,以保持材料的稳定性。然而,由于具有高度不均匀自旋织构的特征,使用广泛使用的连续介质模型来定量计算merons及其动力学是具有挑战性的。在这项工作中,我们发展了一个离散的方法来解决集中自旋结构周围的核心的merons。我们揭示了一个介子之间的相互作用,当它们的距离大于其核心大小的两倍,并获得随后的统计的介子气体。该模型还预测了单个和成对的merons的这些性质如何随着磁交换相互作用而演变,并且结果与使用真实的2D范德华磁性材料的参数的蒙特卡罗模拟非常一致。这种离散化方法不仅能给出重子系统的平衡态统计特性,而且能通过对相互作用的量化来进一步研究重子系统的动力学性质。

英文摘要:

As a fundamental type of topological spin textures in two-dimensional (2D) magnets, a magnetic meron carries half-integer topological charge and forms a pair with its antithesis to keep the stability in materials. However, it is challenging to quantitatively calculate merons and their dynamics by using the widely used continuum model because of the characteristic highly inhomogeneous spin textures. In this work, we develop a discrete method to address the concentrated spin structures around the core of merons. We reveal a logarithmic-scale interaction between merons when their distance is larger than twice their core size and obtain subsequent statistics of meron gas. The model also predicts how these properties of single and paired merons evolve with magnetic exchange interactions, and the results are in excellent agreement with the Monte Carlo simulations using the parameters of real 2D van der Waals magnetic materials. This discrete approach not only shows equilibrium static statistics of meron systems but also is useful to further explore the dynamic properties of merons through the quantified pairing interactions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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