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Valley Filtering and Electronic Optics Using Polycrystalline Graphene.

V Hung Nguyen1, S Dechamps1, P Dollfus2

  • 1Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Chemin des étoiles 8, B-1348 Louvain-la-Neuve, Belgium.

Physical Review Letters
|December 24, 2016
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Summary
This summary is machine-generated.

Strain-induced grain boundaries in polycrystalline graphene enable perfect valley polarization and optical-like behaviors. This research explores manipulating Dirac fermions for novel electronic and photonic applications.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Graphene's unique electronic properties, including Dirac fermions, are of significant interest.
  • Polycrystalline graphene presents structural complexities due to grain boundaries.
  • Understanding electronic behavior at grain boundaries is crucial for device applications.

Purpose of the Study:

  • To theoretically investigate the manipulation of valley-polarized currents in polycrystalline graphene.
  • To explore the optical-like behaviors of Dirac fermions influenced by grain boundaries and strain.
  • To identify mechanisms for controlling electronic properties in polycrystalline graphene.

Main Methods:

  • Theoretical exploration of electronic structures in polycrystalline graphene under strain.
  • Analysis of inversion symmetry breaking at grain boundaries.
  • Modeling of electron wave propagation and refractive index modulation.

Main Results:

  • Applied strain creates domain misorientation at grain boundaries, leading to electronic structure mismatch.
  • This mismatch results in strong inversion symmetry breaking and perfect valley polarization.
  • Graphene domains exhibit different electronic media properties, enabling modulation and negative refractive indexes.

Conclusions:

  • Polycrystalline graphene with engineered grain boundaries offers a platform for valley-polarized current manipulation.
  • The observed optical-like behaviors of Dirac fermions open avenues for novel photonic devices.
  • Strain engineering of grain boundaries is a key strategy for controlling electronic and optical properties.