Non-Hermitian skin effect in magnetic systems
Non-Hermitian skin effect in magnetic systems
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DOI：
10.1103/physrevb.105.l180406
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发表时间：
2022-05-10
影响因子：
3.7
通讯作者：
Flebus, Benedetta
中科院分区：
文献类型：
--
作者：
Deng, Kuangyin;Flebus, Benedetta
非厄米拓扑相远非仅限于厄米拓扑相的简单概括，而是由于其独特的性质而引起了广泛的兴趣。最引人注目的非厄米现象之一是趋肤效应，即宏观部分的体本征态在边界处的局部化，这是体边缘对应关系破裂的基础。在这里，我们开发了一种通用唯象方法来描述晶格模型内的磁耗散，并引入“有效面积定律”来研究磁系统中集肤效应的出现。作为我们方法的测试平台，我们专注于具有自旋非守恒磁振子-声子相互作用的自旋轨道耦合范德华（vdW）铁磁体，发现磁集肤效应出现在适当的温度范围内。我们的结果表明，Dzyaloshinskii-Moriya 相互作用（DMI）和非局域磁耗散之间的干扰在边界处体态的积累中起着关键作用。
Far from being limited to a trivial generalization of their Hermitian counterparts, non-Hermitian topological phases have gained widespread interest due to their unique properties. One of the most striking non-Hermitian phenomena is the skin effect, i.e., the localization of a macroscopic fraction of bulk eigenstates at a boundary, which underlies the breakdown of the bulk-edge correspondence. Here we develop a generic phenomenological approach to describing magnetic dissipation within a lattice model and we introduce an "effective area law" to investigate the emergence of the skin effect in magnetic systems. As a testbed of our approach, we focus on a spin-orbit-coupled van der Waals (vdW) ferromagnet with spin-nonconserving magnon-phonon interactions, finding that the magnetic skin effect emerges in an appropriate temperature regime. Our results suggest that the interference between Dzyaloshinskii-Moriya interaction (DMI) and nonlocal magnetic dissipation plays a key role in the accumulation of bulk states at the boundaries.