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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Physics

Background:

  • Semiconductor moiré superlattices exhibit diverse interaction-driven ground states.
  • Studying twisted homobilayers in the large moiré wavelength limit, where interactions are strongest, has been challenging.

Purpose of the Study:

  • To investigate the electronic properties of twisted bilayer WSe2 (tWSe2) at small twist angles.
  • To demonstrate the existence and tunability of topological phases in this system.

Main Methods:

  • Local electronic compressibility measurements were performed on tWSe2.
  • Small twist angles, including a "magic angle" near 1.23°, were utilized.
  • A locally applied electric field was used to tune quantum phases.

Main Results:

  • Multiple topological bands were identified in tWSe2.
  • A series of Chern insulators were observed at zero magnetic field near the magic angle.
  • A topological quantum-phase transition was induced by an electric field at one hole per moiré unit cell.

Conclusions:

  • The study establishes the topological phase diagram of a generalized Kane-Mele-Hubbard model in tWSe2.
  • Twisted bilayer WSe2 offers a tunable platform for strongly correlated topological phases.
  • This research advances the understanding of exotic phenomena in moiré superlattices.