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Area of Science:

  • Condensed matter physics
  • Materials science
  • Nanotechnology

Background:

  • Valley current arises from Berry curvature in systems lacking inversion symmetry.
  • AB-stacked bilayer graphene exhibits layer symmetry breaking due to Coulomb interactions.
  • Experimental observation of valley current in unbiased bilayer graphene remains elusive.

Purpose of the Study:

  • Investigate Berry curvature in unbiased bilayer graphene.
  • Explore the tunability of Berry curvature with external fields.
  • Demonstrate the potential for creating a valley valve device.

Main Methods:

  • Theoretical analysis of Berry curvature in bilayer graphene.
  • Numerical simulations to model Berry curvature properties.
  • Computational methods to investigate electric field effects.

Main Results:

  • Observed non-zero Berry curvature with opposite signs at K and K' valleys.
  • Confirmed asymmetry in unbiased bilayer graphene.
  • Demonstrated tunability of Berry curvature magnitude and polarity via out-of-plane electric fields.

Conclusions:

  • Unbiased bilayer graphene possesses inherent asymmetry crucial for valley current.
  • Electric fields offer a method to control Berry curvature and valley properties.
  • The findings pave the way for developing novel valleytronic devices, such as a gate-controlled valley valve.