成像拓扑缺陷动力学介导二维斯格明子晶格熔化
Imaging Topological Defect Dynamics Mediating 2D Skyrmion Lattice Melting
AI总结：
本文利用动态克尔显微镜实时实空间成像受限二维斯格明子晶格的两步熔化过程，揭示拓扑缺陷和位错动力学，并发现位错扩散系数比斯格明子高数个数量级。
摘要：
拓扑缺陷是介导二维相变的关键特征。然而，长期以来一直缺乏足够的分辨率和可调性来获取相变动力学。利用动态克尔显微镜，我们以高分辨率在实时和实空间中直接捕捉了受限二维磁性斯格明子晶格的熔化过程。磁性薄膜中的斯格明子是二维的、拓扑非平凡的准粒子，它们提供了丰富的动力学以及独特的可调性，是控制相行为的关键要素：我们在飞行中调节斯格明子尺寸和有效温度，驱动两步熔化过程，该过程经过介于固态晶格和各向同性液体之间的中间六角相区域。我们量化了介导相变的拓扑缺陷的特征性出现，并揭示了迄今为止无法获取的晶格位错动力学。完整的实时和实空间成像揭示了位错的扩散系数，我们发现该系数比斯格明子的扩散系数高出数个数量级。
英文摘要：
Topological defects are the key feature mediating 2D phase transitions. However, both resolution and tunability have been lacking to access the dynamics of the transitions. With dynamic Kerr microscopy, we directly capture the melting of a confined 2D magnetic skyrmion lattice with high resolution in real-time and -space. Skyrmions in magnetic thin films are two-dimensional, topologically non-trivial quasi-particles that provide rich dynamics as well as unique tunability as an essential ingredient for controlling phase behavior: We tune the skyrmion size and effective temperature on the fly to drive the two-step melting through an intermediate hexatic regime between the solid lattice and the isotropic liquid. We quantify the characteristic occurrence of topological defects mediating the transitions and reveal the so-far inaccessible dynamics of the lattice dislocations. The full real-time and -space imaging reveals the diffusion coefficient of the dislocations, which we find to be orders of magnitudes higher than that of the skyrmions.
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。
