Topological Yu-Shiba-Rusinov chain in monolayer transition-metal dichalcogenide superconductors

Abstract

Monolayers of transition-metal dichalcogenides (TMDs) are two-dimensional materials whose low energy sector consists of two inequivalent valleys. The valence bands have a large spin splitting due to strong spin-orbit coupling. Furthermore the spin is polarized up in one valley and down in the other (in directions perpendicular to the two-dimensional crystal). We focus on lightly hole-doped systems where the Fermi surface consists of two disconnected circles with opposite spins. For both proximity induced and intrinsic local attractive interaction induced superconductivity, a fully gapped intervalley pairing state is favored in this system, which is an equal superposition of the singlet and the m=0 triplet for the lack of centrosymmetry. We show that a ferromagnetically ordered magnetic-adatom chain placed on a monolayer TMD superconductor provides a platform to realize one-dimensional topological superconducting state characterized by the presence of Majorana zero modes at its ends. We obtain the topological phase diagram and show that the topological superconducting phase is affected not only by the adatom spacing and the direction of the magnetic moment, but also by the orientation of the chain relative to the crystal.

5 pages + supplemental material, 2 figures. Link: http://link.aps.org/doi/10.1103/PhysRevB.94.060501

References in corpus (11)

• Two Dimensional Atomic Crystals
• Non-Abelian Anyons and Topological Quantum Computation
• Classification of topological insulators and superconductors in three spatial dimensions
• Observation of Majorana Fermions in Ferromagnetic Atomic Chains on a Superconductor
• The Valley Hall Effect in MoS2 Transistors
• Topological Superconductivity induced by Ferromagnetic Metal Chains
• Strong localization of Majorana end states in chains of magnetic adatoms
• Topological Yu-Shiba-Rusinov chain from spin-orbit coupling
• Interplay of topological phases in magnetic adatom-chains on top of a Rashba superconducting surface
• Topological properties of helical Shiba chains with general impurity strength and hybridization
• Odd-frequency pair in topological superconductivity of 1D magnetic chain

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• Yu-Shiba-Rusinov states and topological superconductivity in Ising paired superconductors
• Topological superconductivity from magnetic impurities on monolayer NbSe${}_2$
• Orbital Fulde-Ferrell pairing state in moiré Ising superconductors
• Pressure-induced Superconductivity and Topological Quantum Phase Transitions in the Topological Semimetal ZrTe2
• Supercurrent as a Probe for Topological Superconductivity in Magnetic Adatom Chains
• Strongly enlarged topological regime and enhanced superconducting gap in nanowires coupled to Ising superconductors
• Ising superconductivity in noncentrosymmetric bulk NbSe2