Robust parity-mixed superconductivity in disordered monolayer transition metal dichalcogenides

Abstract

Monolayer NbSe${}_2$ is a nodal topological Ising superconductor at magnetic in-plane fields exceeding the Pauli limit, with nodal points strictly on high symmetry lines in the Brillouin zone. Here, we use a combined numerical and group-theoretical approach in real-space to characterize the unconventional superconducting state in monolayer transition metal dichalcogenides. Even with a conventional pairing interaction, the superconducting state is intrinsically parity-mixed and robust against on-site disorder. The interplay between the Zeeman magnetic field, strong spin-orbit interaction, and electronic orbital content confer the unique superconducting and topological properties. The discussion also extends to strongly hole-doped MoS${}_2$ and its relatives.

25 pages, 9 figures

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• Theory of Multi-Orbital Topological Superconductivity in Transition Metal Dichalcogenides
• Magnetic impurities in thin films and 2D Ising superconductors
• Ising superconductivity: a first-principles perspective
• Topological Ising pairing states in monolayer and trilayer TaS${}_2$
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• Controlling charge and spin transport in an Ising-superconductor Josephson junction
• A mechanism for $\pi$ phase shifts in Little-Parks experiments: application to 4Hb-TaS${}_2$ and to 2H-TaS${}_2$ intercalated with chiral molecules
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• Pseudo-spin triplet superconductivity in transition-metal dichalcogenide monolayers and Andreev reflection in the lateral heterostructures of 2$H$-NbSe${}_2$
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• Three-orbital continuous model for $1H$-type metallic transition-metal dichalcogenide monolayers
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• A unified theoretical framework for Kondo superconductors: Periodic Anderson impurities with attractive pairing and Rashba spin-orbit coupling
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• Pairing symmetries in the Zeeman-coupled extended attractive Hubbard model