Spiral magnetic order and topological superconductivity in a chain of magnetic adatoms on a two-dimensional superconductor

Morten H. Christensen, Michael Schecter, Karsten Flensberg, Brian M. Andersen, Jens Paaske

Research output: Contribution to journalArticle

17 Scopus citations

Abstract

We study the magnetic and electronic phases of a one-dimensional (1D) magnetic adatom chain on a 2D superconductor. In particular, we confirm the existence of a "self-organized" 1D topologically nontrivial superconducting phase within the set of subgap Yu-Shiba-Rusinov states formed along the magnetic chain. This phase is stabilized by incommensurate spiral correlations within the magnetic chain that arise from the competition between short-range ferromagnetic and long-range antiferromagnetic electron-induced exchange interactions, similar to a recent study for a 3D superconductor [M. Schecter, Phys. Rev. B 93, 140503(R) (2016)1098-012110.1103/PhysRevB.93.140503]. The exchange interactions along diagonal directions are also considered and found to display behavior similar to a 1D substrate when close to half filling. We show that the topological phase diagram is robust against local superconducting order parameter suppression and weak substrate spin-orbit coupling. Lastly, we study the effect of a direct ferromagnetic exchange coupling between the adatoms, and find the region of spiral order in the phase diagram to be significantly enlarged in a wide range of the direct exchange coupling.

Original languageEnglish (US)
Article number144509
JournalPhysical Review B
Volume94
Issue number14
DOIs
StatePublished - Oct 18 2016

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