Superconductivity in twisted bilayer WSe${}_2$

Abstract

The discovery of superconductivity in twisted bilayer and twisted trilayer graphene has generated tremendous interest. The key feature of these systems is an interplay between interlayer coupling and a moiré superlattice that gives rise to low-energy flat bands with strong correlations. Flat bands can also be induced by moiré patterns in lattice-mismatched and or twisted heterostructures of other two-dimensional materials such as transition metal dichalcogenides (TMDs). Although a wide range of correlated phenomenon have indeed been observed in the moiré TMDs, robust demonstration of superconductivity has remained absent. Here we report superconductivity in 5 degree twisted bilayer WSe${}_2$ (tWSe${}_2$) with a maximum critical temperature of 426 mK. The superconducting state appears in a limited region of displacement field and density that is adjacent to a metallic state with Fermi surface reconstruction believed to arise from antiferromagnetic order. A sharp boundary is observed between the superconducting and magnetic phases at low temperature, reminiscent of spin-fluctuation mediated superconductivity. Our results establish that moiré flat-band superconductivity extends beyond graphene structures. Material properties that are absent in graphene but intrinsic among the TMDs such as a native band gap, large spin-orbit coupling, spin-valley locking, and magnetism offer the possibility to access a broader superconducting parameter space than graphene-only structures.

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• Superconductivity in twisted transition metal dichalcogenide homobilayers
• Quantum Geometric Kohn-Luttinger Superconductivity
• Superconductivity in twisted WSe${}_2$ from topology-induced quantum fluctuations
• Enhanced Kohn-Luttinger topological superconductivity in bands with nontrivial geometry
• Experimental signature of layer skyrmions and implications for band topology in twisted WSe2 bilayers
• Theory of Topological Superconductivity and Antiferromagnetic Correlated Insulators in Twisted Bilayer WSe${}_2$
• Twist-angle evolution of the intervalley-coherent antiferromagnet in twisted WSe${}_2$
• Theory of intervalley-coherent AFM order and topological superconductivity in tWSe${}_2$
• A New Moiré Platform Based on M-Point Twisting
• Quantum Geometry and the Hidden Scales in Materials
• Minimal Fractional Topological Insulator in half-filled conjugate moiré Chern bands
• Approximate symmetries, insulators, and superconductivity in continuum-model description of twisted WSe${}_2$
• Topological Chiral Superconductivity Mediated by Intervalley Antiferromagnetic Fluctuations in Twisted Bilayer WSe${}_2$
• General Electronic Structure Calculation Method for Twisted Systems
• Pressure-Driven Moiré Potential Enhancement and Tertiary Gap Opening in Graphene/h-BN Heterostructure
• Moiré Band Engineering in Twisted Trilayer WSe2
• Chiral superconductivity from spin polarized Chern band in twisted MoTe${}_2$
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• Quantum Phases in Twisted Homobilayer Transition Metal Dichalcogenides
• Electronic structure and transport in materials with flat bands: 2D materials and quasicrystals
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• Optical properties, plasmons, and orbital Skyrme textures in twisted TMDs
• Topological Kondo semimetals emulated in hetero-bilayer transition metal dichalcogenides
• Anisotropic moiré band flattening in twisted bilayers of M-valley MXenes
• Stacking-tunable multiferroic states in bilayer ScI2
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• Impact of the angular alignment on the crystal field and intrinsic doping of bilayer graphene/BN heterostructures
• Mean-field Modelling of Moiré Materials: A User's Guide with Selected Applications to Twisted Bilayer Graphene
• Review of the tight-binding method applicable to the properties of moiré superlattices
• Tuning transport in solid-state Bose-Fermi mixtures by Feshbach resonances
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• Angular momentum of vortex-core Majorana zero modes
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• Theory for Lattice Relaxation in Marginal Twist Moirés
• Instabilities of a Generalized Gross-Neveu Quantum Criticality
• Moire Engineering of Cooper-Pair Density Modulation States
• Charged moiré phonons in twisted bilayer graphene
• Heavy fermion phase diagram in magic-angle twisted trilayer graphene
• Propagating Collective Spin-valley Modes in Twisted WSe2
• Designer three-dimensional electronic bands in asymmetric transition metal dichalcogenide heterostructures
• Enhanced Andreev Reflection in Flat-Band Systems: Wave Packet Dynamics, DC Transport and the Josephson Effect
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• Doping-induced Quantum Anomalous Hall Crystals and Topological Domain Walls
• Stripe antiferromagnetism and chiral superconductivity in tWSe${}_2$
• Higher Chern bands in helical homotrilayer transition metal dichalcogenides
• Microscopic theory for electron-phonon coupling in twisted bilayer graphene
• Robustness of real-space topology in moiré systems
• The fate of disorder in twisted bilayer graphene near the magic angle
• Relaxation and Its Effects on Electronic Structure in Twisted Systems: An Analytical Perspective
• Magnetic Ordering in Moiré Graphene Multilayers from a Continuum Hartree+U Approach