论文标题

磁纹理晶体引起的拓扑超导性

Topological Superconductivity Induced by Magnetic Texture Crystals

论文作者

Steffensen, Daniel, Christensen, Morten H., Andersen, Brian M., Kotetes, Panagiotis

论文摘要

我们介绍了拓扑阶段和主要范围(MF)激发的详细研究,这些兴奋是由(un)常规的一个/两波段旋转式超导性和许多磁性纹理晶体之间的批量相互作用引起的。后者定义了不均匀的磁化谱,该磁化谱由定期重复的原始细胞组成。在这里,我们专注于具有螺旋,旋转和天空类型的原始细胞的磁纹理晶体,这些晶体具有不同的对称特性。我们确定了许多可访问的拓扑阶段,它们具有扁平,单向或双向(Quasi-)或手性MF边缘模式。这种丰富的品种源自与拓扑相之间的相互作用,而间隙和淋巴结和淋巴结的能量光谱。出现的拓扑超导阶段的类型以及所产生的MF的特征仅取决于所谓的磁和配对点/空间组的性质和兼容性。我们的分析是一般的,并且不依赖于此处采用的模型的特定参数,以示例可访问的拓扑场景。因此,我们的结果可以扩展到具有多个频段的系统,与各种分层材料和混合设备有关,并为强,弱和结晶的拓扑阶段提供预测。

We present a detailed investigation of the topological phases and Majorana fermion (MF) excitations that arise from the bulk interplay between (un)conventional one/two-band spin-singlet superconductivity and a number of magnetic texture crystals. The latter define inhomogeneous magnetization profiles which consist of a periodically-repeating primitive cell. Here we focus on magnetic texture crystals with a primitive cell of the helix, whirl, and skyrmion types, which feature distinct symmetry properties. We identify a multitude of accessible topological phases which harbor flat, uni- or bi-directional, (quasi-)helical, or chiral MF edge modes. This rich variety originates from the interplay between topological phases with gapped and nodal bulk energy spectra. The types of the emerging topological superconducting phases and the features of the arising MFs are solely determined by the properties and compatibility of the so-called magnetic and pairing point/space groups. Our analysis is general and does not rely on specific parameters of the models employed here to exemplify the topological scenarios which become accessible. Therefore, our results can be extended to systems with multiple bands, are relevant for a wide range of layered materials and hybrid devices, and provide predictions for strong, weak and crystalline topological phases.

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