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Giant nonlinear Hall effect in twisted bilayer WSe2.

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Researchers engineered a novel nonlinear Hall effect (NHE) in twisted WSe2 bilayers, achieving significantly enhanced signals. This discovery opens new avenues for studying quantum phenomena and critical states.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • The nonlinear Hall effect (NHE) offers a new route to generate second-harmonic electrical Hall signals under time-reversal-symmetric conditions.
  • Previous studies on NHE were limited to a few non-interacting systems.

Purpose of the Study:

  • To introduce a novel approach for engineering NHE using twisted moiré structures.
  • To investigate the NHE in twisted WSe2 bilayers and explore mechanisms for enhanced signal generation.

Main Methods:

  • Fabrication of twisted WSe2 bilayers.
  • Tuning the Fermi level to moiré flat bands.
  • Resistivity measurements to analyze signal origins.

Main Results:

  • Observed NHE in twisted WSe2 bilayers when Fermi level aligned with moiré flat bands.
  • Achieved a sharp peak in the nonlinear Hall signal with generation efficiency two orders of magnitude greater than previous experiments when the first moiré band was half-filled.
  • Identified potential origins including moiré-interface-induced correlation effects and Mott transitions.

Conclusions:

  • Demonstrated that interaction effects combined with Berry curvature dipoles can create novel quantum phenomena.
  • Highlighted the potential of NHE measurements as a tool for probing quantum criticality.