Identifying Topological Superconductivity in 2D Transition-Metal Dichalcogenides

Abstract

We study the superconducting pairing instabilities and gap functions for prototypical two-dimensional (2D) transition-metal dichalcogenides (TMDCs) WS${}_2$, MoTe${}_2$, and MoS${}_2$ in the 2H phase under both hole and electron doping at 10 K. Our first-principles quantum many-body Green's function approach allows us to treat the full $d$ and $p$ manifold of orbitals with strong spin-orbit coupling, yielding pairing predictions with material specific detail. The resulting gap functions exhibit a variety of mixed-parity superconducting states, including $s$, $p$, $d$, $f$, $d\pm id$, and $p\pm ip$ pairing modes. In particular, we predict 3% and 4% hole-doped WS${}_2$ to be a chiral $p\pm ip$ topological superconductor. For 1% hole-doped MoS${}_2$, we find a competition between three doubly degenerate chiral and non-chiral instabilities. Overall, the relative pairing strengths are found to follow the Fermi surface topology, due to nesting between the Fermi surface sheets. Finally, we discuss our predictions in relation to available experimental data and classify the topology of the predicted superconducting pairing symmetries.

22 pages, 8 figures, 6 tables

References in corpus (18)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Non-Abelian Anyons and Topological Quantum Computation
• Quantum computational advantage using photons
• Computational 2D Materials Database: Electronic Structure of Transition-Metal Dichalcogenides and Oxides
• Strong quantum computational advantage using a superconducting quantum processor
• Near-degeneracy of several pairing channels in multiorbital models for the Fe-pnictides
• The GW compendium: A practical guide to theoretical photoemission spectroscopy
• Observation of broken time-reversal symmetry in the heavy fermion superconductor UPt${}_3$
• Magnetism in MoS2 induced by MeV proton irradiation
• Electrostatically Induced Superconductivity at the Surface of WS${}_2$
• Orbital Selective Superconductivity in a Two-band Model of Infinite-Layer Nickelates
• Topological Landscape of Competing Charge Density Waves in 2H-NbSe2
• On interband pairing in multiorbital systems
• Superconductivity in Infinite-layer Nickelates : Role of Non-zero f-ness
• Leading superconducting instabilities in three-dimensional models for Sr2RuO4
• Symmetry analysis of odd- and even-frequency superconducting gap symmetries for time-reversal symmetric interactions
• Exotic interband pairing in multiband superconductors
• Coulomb matrix elements in multi-orbital Hubbard models

Cited by in corpus (3)

• Realizing Topological Superconductivity in Tunable Bose-Fermi Mixtures with Transition Metal Dichalcogenide Heterostructures
• Nonlinear optical responses in multi-orbital topological superconductors
• Gor'kov-Hedin-Baym Equations for Quantum Many-Body Systems with Spin-Dependent Interactions