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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Aharonov-Bohm (AB) interferences are crucial in quantum Hall systems.
  • Existing methods for achieving AB interferences involve quantum point contacts, graphene p-n junctions, and magnetic heterostructures.
  • Efficient electron transmission between edge channels is necessary for AB interferences.

Purpose of the Study:

  • To propose defect scattering as a novel mechanism for achieving Aharonov-Bohm interferences in polycrystalline graphene.
  • To investigate the role of extended defects as tunneling paths for quantum Hall edge channels.
  • To demonstrate the applicability of this approach in graphene-based nanostructures.

Main Methods:

  • Theoretical investigation of electron transport in polycrystalline graphene with extended defects.
  • Modeling defect scattering as tunneling paths connecting quantum Hall edge channels.
  • Predicting conductance oscillations in systems with parallel grain boundaries.

Main Results:

  • Defect scattering in polycrystalline graphene facilitates electron transmission between edge channels.
  • Strong Aharonov-Bohm oscillations in conductance are predicted in graphene with two parallel grain boundaries.
  • The proposed mechanism is adaptable to graphene nano-systems with functional impurities.

Conclusions:

  • Defect scattering provides an alternative pathway for achieving Aharonov-Bohm interferences in the quantum Hall regime.
  • Polycrystalline graphene with grain boundaries is a promising platform for observing AB oscillations.
  • The approach is extendable to other 2D materials beyond graphene.