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Updated: May 31, 2025

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Superconductivity in 5.0° twisted bilayer WSe2.

Yinjie Guo1, Jordan Pack1, Joshua Swann1

  • 1Department of Physics, Columbia University, New York, NY, USA.

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|January 22, 2025
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Superconductivity was discovered in twisted bilayer tungsten diselenide (WSe2), a transition metal dichalcogenide. This finding extends moiré flat-band superconductivity beyond graphene, opening new avenues for exploring exotic electronic states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Superconductivity in twisted bilayer graphene arises from moiré superlattices and flat bands.
  • Moiré patterns in other 2D materials, like transition metal dichalcogenides (TMDs), induce flat bands but superconductivity has been elusive.
  • Correlated phenomena are observed in moiré TMDs, yet robust superconductivity remains unconfirmed.

Purpose of the Study:

  • To investigate superconductivity in twisted bilayer transition metal dichalcogenides.
  • To explore the potential of moiré flat bands in materials beyond graphene for superconductivity.
  • To characterize the superconducting state and its relationship with other electronic phases in twisted bilayer WSe2.

Main Methods:

  • Fabrication of twisted bilayer WSe2 heterostructures with a specific twist angle (5.0°).
  • Electrical transport measurements to detect signatures of superconductivity.
  • Investigation of the phase diagram as a function of displacement field and carrier density.

Main Results:

  • Superconductivity observed in 5.0° twisted bilayer WSe2 with a critical temperature up to 426 mK.
  • The superconducting state is adjacent to a metallic phase with Fermi surface reconstruction linked to antiferromagnetic order.
  • A sharp boundary between superconducting and magnetic phases suggests spin fluctuation-mediated superconductivity.

Conclusions:

  • Moiré flat-band superconductivity is not limited to graphene systems.
  • Transition metal dichalcogenides offer unique material properties (e.g., spin-orbit coupling, magnetism) for broader superconducting parameter space exploration.
  • This work establishes twisted bilayer WSe2 as a new platform for studying correlated superconductivity in moiré systems.