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Topological superconductivity from repulsive interactions in twisted WSe$_2$
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abstract
The recent observation of superconductivity in twisted bilayer WSe$_2$ raises intriguing questions concerning the origin and the properties of superconducting states realized in bands with non-trivial topological properties and repulsive electron-electron interactions. Using a continuum band structure model, we analyze a mechanism for Coulomb interaction-driven superconductivity in twisted bilayers of WSe$_2$. We discuss the symmetries and the phenomenological properties of the resulting superconducting phases and their evolution with interlayer potential difference, tunable via an out of plane electric field. The pairing strength is a non-monotonic function of interlayer potential, being larger at intermediate values due to mixing of singlet and triplet pairing. In contrast, at larger interlayer potential, the pairing tendency is suppressed due to enhanced Coulomb repulsion. The superconducting state is chiral in a large regime of parameters and undergoes a transition to a nodal nematic superconductor at a critical potential difference. The chiral state, characterized by an intervalley-symmetric superposition of triplet and singlet pairs, is classified as a topological superconductor within the Altland-Zirnbauer class C. At zero interlayer potential difference, the superconducting state is instead of class D, which hosts Majorana zero modes, making it a promising candidate for applications in quantum computation.
Forward citations
Cited by 8 Pith papers
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At ν=1 in 3.65°-twisted WSe2, Hartree-Fock predicts that the 120° antiferromagnet gives way to coplanar or non-coplanar multi-Q magnetic order with four ordering wavevectors and soft M-point spin fluctuations.
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Superconducting Acoustogalvanic Effect in Twisted Transition Metal Dichalcogenides
Surface acoustic waves can drive a nonlinear current in twisted WSe2 superconductors whose angular and frequency pattern distinguishes chiral from nematic pairing.
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A patch renormalization-group model of six van Hove points predicts that increasing displacement field in twisted WSe2 turns chiral d/p-wave superconductivity into a spatially modulated valley ferromagnet.
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Emergent Interacting Phases in the Strong Coupling Limit of Twisted M-Valley Moir\'e Systems: Application to SnSe${}_2$
Twisted SnSe2 realizes quasi-1D triangular (AA) and kagome (AB) interacting models with predicted dimer, valence-bond-solid, and frustrated spin-liquid phases.
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Topological chiral superconductivity from antiferromagnetic correlations in moir\'{e} bands with extreme spin-orbit coupling
The energetically favored superconducting pairing in two strong-coupling models of twisted bilayer WSe2 is chiral and topological, with p/d wave mixing and Chern number ±1 or ±2.
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Electrostatic Charge Fractionalization and Unconventional Superconductivity in Strained Monolayer Graphene
Periodically strained monolayer graphene is predicted to exhibit Hartree-induced sublattice-polarized states, fractional-filling charge density waves, and Kohn-Luttinger superconductivity with Tc up to about 9.5 K.
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Topology and compact molecular orbitals in twisted bilayer WSe$_2$
The top two moiré valence bands of twisted WSe2, computed from first principles, carry Chern number C=+1 each and decompose into a compact f-orbital plus a topological c-orbital, giving ab initio parameters for effect...
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