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Spin response and topology of a staggered Rashba superconductor
- Source :
- Phys. Rev. Research 3, 033133 (2021)
- Publication Year :
- 2021
-
Abstract
- Inversion symmetry is a key symmetry in unconventional superconductors and even its local breaking can have profound implications. For inversion-symmetric systems, there is a competition on a microscopic level between the spin-orbit coupling associated with the local lack of inversion and hybridizing terms that `restore' inversion. Investigating a layered system with alternating mirror-symmetry breaking, we study this competition considering the spin response of different superconducting order parameters for the case of strong spin-orbit coupling. We find that signatures of the local non-centrosymmetry, such as an increased spin susceptibility in spin-singlet superconductors for $T\rightarrow 0$, persist even into the quasi-three-dimensional regime. This leads to a direction dependent spin response which allows to distinguish different superconducting order parameters. Furthermore, we identify several regimes with possible topological superconducting phases within a symmetry-indicator analysis. Our results may have direct relevance for the recently reported Ce-based superconductor CeRh$_2$As$_2$ and beyond.
- Subjects :
- Condensed Matter - Superconductivity
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Research 3, 033133 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2103.06282
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevResearch.3.033133