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Topological superconductivity in a multichannel Yu-Shiba-Rusinov chain

2016; American Physical Society; Volume: 93; Issue: 2 Linguagem: Inglês

10.1103/physrevb.93.024507

2469-9977

Junhua Zhang, Younghyun Kim, Enrico Rossi, Roman M. Lutchyn,

Advanced Condensed Matter Physics

Chains of magnetic atoms placed on the surface of an s-wave superconductor with large spin-orbit coupling provide a promising platform for the realization of topological superconducting states characterized by the presence of Majorana zero-energy modes. In this work we study the properties of the one-dimensional chain of Yu-Shiba-Rusinov states induced by magnetic impurities using a realistic model for the magnetic atoms that include the presence of multiple scattering channels. These channels are mixed by the spin-orbit coupling and, via the hybridization of the Yu-Shiba-Rusinov states at different sites of the chain, result in a multi-band structure for the chain. We obtain the topological phase diagram for such band structure. We identify the parameter regimes for which the different bands lead to a topological phase and show that the inclusion of higher bands can greatly enlarge the phase space for the realization of topological states.