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Topological superconductivity induced by magnetic texture crystals

Dec 17, 2020
46 pages
Published in:
  • Phys.Rev.Res. 4 (2022) 1, 013225
  • Published: Mar 24, 2022
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Abstract: (APS)
We present a detailed investigation of the topological phases and Majorana fermion (MF) excitations that arise from the bulk interplay between (un)conventional one- and 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, unidirectional, bidirectional, (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 and 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.
Note:
  • 46 pages, 25 panels of figures, 5 tables, 4 appendices; Version close to the one appearing soon in Physical Review Research