Quantum Magnetism and Topological Superconductivity in Yu-Shiba-Rusinov Chains
Jacob F. Steiner, Christophe Mora, Katharina J. Franke, Felix von Oppen
Abstract
Chains of magnetic adatoms on superconductors have been discussed as promising systems for realizing Majorana end states. Here, we show that dilute Yu-Shiba-Rusinov (YSR) chains are also a versatile platform for quantum magnetism and correlated electron dynamics, with widely adjustable spin values and couplings. Focusing on subgap excitations, we derive an extended t-J model for dilute quantum YSR chains and use it to study the phase diagram as well as tunneling spectra. We explore the implications of quantum magnetism for the formation of a topological superconducting phase, contrasting it to existing models assuming classical spin textures.
Topics & Concepts
MagnetismSuperconductivityPhysicsCondensed matter physicsMAJORANAQuantumPhase diagramSpin (aerodynamics)Quantum computerQuantum phasesTopology (electrical circuits)Phase (matter)Quantum phase transitionQuantum mechanicsMathematicsCombinatoricsThermodynamicsPhysics of Superconductivity and MagnetismTopological Materials and PhenomenaAdvanced Condensed Matter Physics