Collective Yu-Shiba-Rusinov states in magnetic clusters at superconducting surfaces

Article

关键词: LOCAL ELECTRONIC-STRUCTURE;    MAJORANA FERMIONS;    EXCHANGE;    IMPURITY;    MOMENTS;    ANYONS;    CHAINS;   

DOI  :  10.1103/PhysRevB.97.184503

来源: SCIE

【 摘 要 】

We study the properties of collective Yu-Shiba-Rusinov (YSR) states generated by multiple magnetic adatoms (clusters) placed on the surface of a superconductor. For magnetic clusters with equal distances between their constituents, we demonstrate the formation of effectively spin-unpolarized YSR states with subgap energies independent of the spin configuration of the magnetic impurities. We solve the problem analytically for arbitrary spin structure and analyze both spin-polarized (dispersive energy levels) and spin-unpolarized (pinned energy levels) solutions. While the energies of the spin-polarized solutions can be characterized solely by the net magnetic moment of the cluster, the wave functions of the spin-unpolarized solutions effectively decouple from it. This decouplingmakes them stable against thermal fluctuation and detectable in scanning tunneling microscopy experiments.

【 授权许可】

Free