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Tunable Graphene Phononic Crystal.

Jan N Kirchhof1, Kristina Weinel1,2, Sebastian Heeg1

  • 1Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.

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|February 24, 2021
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Summary
This summary is machine-generated.

Researchers tuned phononic crystals using graphene and mechanical pressure. This created a tunable system with a localized defect mode, showing potential for advanced mechanical applications.

Keywords:
NEMSNanomechanicsgrapheneoptomechanicsphononic crystalresonators

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Area of Science:

  • Phononics
  • Materials Science
  • Nanotechnology

Background:

  • Periodic patterning in phononic crystals (PnCs) controls vibrations, heat, and sound.
  • PnCs exhibit bandgaps, enabling low-dissipation vibrational modes for applications like mechanical qubits and sensing.

Purpose of the Study:

  • To explore the tuning of phononic crystals using applied mechanical pressure.
  • To investigate the vibrational properties of the thinnest possible PnC fabricated from monolayer graphene.

Main Methods:

  • Fabrication of a phononic crystal from monolayer graphene.
  • Simulation of vibrational properties and defect mode localization.
  • Simulation of mechanical tuning of the PnC using electrostatic pressure.

Main Results:

  • A bandgap was identified in the megahertz regime.
  • A localized defect mode with a small effective mass (0.72 ag) was found within the bandgap.
  • Mechanical tuning via electrostatic pressure (up to 30 kPa) caused a ~350% frequency upshift, while the defect mode remained localized within the bandgap.

Conclusions:

  • Monolayer graphene PnCs offer a high-quality, dynamically tunable mechanical system.
  • The observed frequency tunability suggests potential for advanced phononic devices.
  • This work combines phononics with 2D materials for novel applications.