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An electrical analogy to Mie scattering.

José M Caridad1, Stephen Connaughton1, Christian Ott2

  • 1School of Physics, Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), AMBER at CRANN, Trinity College Dublin, College Green, Dublin 2, Ireland.

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Researchers experimentally demonstrated an electrical analogue to Mie scattering using graphene. This phenomenon, observed in diffusive transport at room temperature, generates a transverse voltage, paving the way for novel electronic metamaterials.

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Area of Science:

  • Condensed matter physics
  • Nanophotonics and plasmonics
  • Materials science

Background:

  • Mie scattering typically describes light scattering by particles, with theoretical proposals for its electron-state analogue in ballistic graphene lacking experimental evidence.
  • Previous theoretical work suggested electron scattering by cylindrical potentials in graphene, but experimental verification remained elusive.

Purpose of the Study:

  • To experimentally demonstrate an electrical analogue of Mie scattering in a realistic solid-state system.
  • To investigate the potential for creating functional electronic metamaterials based on this phenomenon.

Main Methods:

  • Utilizing graphene as a conductor with circular potentials in a 2D array.
  • Conducting experiments under diffusive transport conditions at room temperature.
  • Employing a canted array arrangement relative to the incident current to observe effects.

Main Results:

  • A robust transverse voltage was generated due to cascaded Mie scattering.
  • The observed transverse voltage responded predictably to electrostatic gating and variations in the circular potentials.
  • The experimental results provided strong evidence for Mie scattering as the underlying mechanism.

Conclusions:

  • The study successfully demonstrated an electrical analogue to Mie scattering in graphene under diffusive transport conditions.
  • The findings validate the theoretical concept and open avenues for designing novel electronic metamaterials.
  • This work bridges optical phenomena with electronic properties in condensed matter systems.