Yu-Shiba-Rusinov states and topological superconductivity in Ising paired superconductors

Abstract

An unusual form of superconductivity, called Ising superconductivity, has recently been uncovered in mono- and few-layered transition metal dichalcogenides. This 2D superconducting state is characterized by the so-called Ising spin-orbit coupling (SOC), which produces strong oppositely oriented effective Zeeman fields perpendicular to the 2D layer in opposite momentum space valleys. We examine the Yu-Shiba-Rusinov (YSR) bound states localized at magnetic impurities in Ising superconductors and show that the unusual SOC manifests itself in unusually strong anisotropy in magnetic field response of zero bias conductance peaks observable in STM experiments on impurity sites. For a chain of magnetic impurities with moments parallel to the plane of Ising superconductors we show that the low energy YSR band can host topological superconductivity and Majorana fermions as a direct manifestation of Ising spin-orbit coupling induced topological effects.

Replaced with version accepted in Physical Review B. 7 pages, 4 figures

References in corpus (8)

• The electronic properties of graphene
• Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• Non-Abelian quantum order in spin-orbit-coupled semiconductors: The search for topological Majorana particles in solid state systems
• Topological Yu-Shiba-Rusinov chain from spin-orbit coupling
• Majorana Fermions in Chiral Topological Ferromagnetic Nanowires
• Majorana fermions in ferromagnetic chains on the surface of bulk spin-orbit coupled $s$-wave superconductors
• Topological Yu-Shiba-Rusinov chain in monolayer transition-metal dichalcogenide superconductors

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• Yu-Shiba-Rusinov states of impurities in a triangular lattice of NbSe${}_2$ with spin orbit coupling
• Topological superconductivity from magnetic impurities on monolayer NbSe${}_2$
• Tunable topological Nernst effect in 2D transition metal dichalcogenides
• Orbital Fulde-Ferrell pairing state in moiré Ising superconductors
• Switch effect and $0$-$\pi$ transition in Ising superconductor Josephson junctions
• Engineering anomalous Floquet Majorana modes and their time evolution in helical Shiba chain
• Magnetic impurities in thin films and 2D Ising superconductors
• Topological Ising pairing states in monolayer and trilayer TaS${}_2$
• Strongly enlarged topological regime and enhanced superconducting gap in nanowires coupled to Ising superconductors
• Tailoring phase transition from topological superconductor to trivial superconductor induced by magnetic textures of a spin-chain on a $p$-wave superconductor
• Photo-induced SU(3) topological material of spinless fermions
• Ising superconductivity in noncentrosymmetric bulk NbSe2
• Effects of electron-electron interactions in the Yu-Shiba-Rusinov lattice model
• Non-Abelian Evolution of a Majorana Train in a Single Josephson Junction
• Local breaking of the spin degeneracy in the vortex states of Ising superconductors: Induced antiphase ferromagnetic order
• Topological superconductivity and superconducting diode effect mediated via unconventional magnet and Ising spin-orbit coupling