Interplay between pairing and correlations in spin-polarized bound states

TL;DR

This paper examines how pairing interactions and correlations influence bound states in superconductors with magnetic impurities, especially under spin-orbit coupling, revealing insights into Majorana-like states and their magnetic properties.

Contribution

It provides a detailed analysis of the interplay between pairing and correlations in spin-polarized bound states, including Majorana quasiparticles, in superconducting systems with spin-orbit coupling.

Findings

Spin-orbit coupling affects energies and polarization of bound states.

Bound states in proximitized Rashba chains resemble Majorana quasiparticles.

Leakage of Majorana states interacts with the subgap Kondo effect.

Abstract

We investigate the single and multiple defects embedded in a superconducting host, studying interplay between the proximity induced pairing and interactions. We explore influence of the spin-orbit coupling on energies, polarization and spatial patterns of the bound (Yu-Shiba-Rusinov) states of magnetic impurities in 2-dimensional square lattice. We also address the peculiar bound states in the proximitized Rashba chain, resembling the Majorana quasiparticles, focusing on their magnetic polarization which has been recently reported by S. Jeon et al., [Science 358, 772 (2017)]. Finally, we study leakage of these polarized Majorana quasiparticles on the side-attached nanoscopic regions and confront them with the subgap Kondo effect near to the singlet-doublet phase transition.