超晶格中的超声弹性响应
Ultrasonic elastic responses in monopole lattice
摘要：
最新的实验进展已经将手征磁体（MnSi/MnGe）中的耦合机械自由度的场景扩展到拓扑非平凡的skyrmion晶体，甚至是晶格。本文利用自旋波理论，提出了一个声学声子和磁振子相互作用的模型，用以解释具有拓扑相变的声子晶格中的实验现象，即：电子-反电子对的湮灭我们再现的各向异性磁弹性调制的弹性模量：激烈的超声软化周围的相变和多峰和沟槽的精细结构的声波平行和正交的磁场，分别。与实验结果的比较表明，Dzyaloshinskiii-Moriya相互作用引起的磁弹性耦合与交换相互作用引起的磁弹性耦合相当。其他的可能性，如弹性硬化也预测。研究表明，MnGe中的非线性缺陷及其运动起着至关重要的作用。
英文摘要：
The latest experimental advances have extended the scenario of coupling mechanical degrees of freedom in chiral magnets (MnSi/MnGe) to the topologically nontrivial skyrmion crystal and even monopole lattices. Equipped with a spin-wave theory highlighting the topological features, we devise an interacting model for acoustic phonons and magnons to explain the experimental findings in a monopole lattice with a topological phase transition, i.e., annihilation of monopole-antimonopole pairs. We reproduce the anisotropic magnetoelastic modulations of elastic moduli: drastic ultrasonic softening around the phase transition and a multi-peak-and-trench fine structure for sound waves parallel and orthogonal to the magnetic field, respectively. Comparison with experiments indicates that the magnetoelastic coupling induced by Dzyaloshinskii-Moriya interaction is comparable to that induced by the exchange interaction. Other possibilities such as elastic hardening are also predicted. The study implies that the monopole defects and their motion in MnGe play a crucial role.
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