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Physics. Creating and probing electron whispering-gallery modes in graphene.

Yue Zhao1, Jonathan Wyrick2, Fabian D Natterer2

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Researchers created novel whispering-gallery mode resonators in graphene using scanning tunneling probes. This breakthrough offers a new method for controlling electronic waves, potentially enabling advanced electronic lenses and resonators.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Optics
  • Materials Science

Background:

  • Designing high-finesse resonant cavities for electronic waves is challenging due to short electron coherence lengths in solids.
  • Previous methods for confining electronic waves involved adatoms on metallic surfaces.

Purpose of the Study:

  • To demonstrate a new approach for creating electronic wave resonators inspired by acoustic whispering galleries.
  • To utilize graphene's unique electronic properties for wave confinement.

Main Methods:

  • Creating whispering-gallery mode (WGM) resonators by inducing circular pn junctions in graphene using a scanning tunneling probe.
  • Utilizing a back-gated graphene device to tune resonator size and carrier concentration.
  • Leveraging graphene's gate-tunable, light-like charge carriers.

Main Results:

  • Successfully created tunable WGM resonators in graphene.
  • Demonstrated control over resonator size and carrier concentration.
  • Observed WGM-type confinement and associated resonances.

Conclusions:

  • The developed WGM resonators represent a novel addition to quantum electron-optics.
  • This technique offers a promising pathway for the development of electronic lenses and resonators.