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Tunable phonon-cavity coupling in graphene membranes.

R De Alba1, F Massel2, I R Storch1

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Graphene membranes exhibit strong phonon-cavity effects at room temperature, enabling mechanical lasing and Brownian motion cooling. This opens new avenues for nonlinear mechanics research without cryogenic conditions.

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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Materials science

Background:

  • Macroscopic quantum systems utilize interactions between optical cavities and mechanical resonators.
  • Phonon-cavity coupling involves energy exchange mediated by material nonlinearity.
  • Previous demonstrations required high-quality factor crystalline systems at cryogenic temperatures.

Purpose of the Study:

  • Propose graphene as a novel material for studying nonlinear mechanics.
  • Investigate phonon-cavity effects in graphene membranes at room temperature.
  • Explore tunable intermodal coupling and nonlinear phenomena in graphene.

Main Methods:

  • Fabrication of circular graphene membranes.
  • Observation of phonon-cavity effects at room temperature.
  • Characterization of parametric effects and their quenching.

Main Results:

  • Demonstrated strong phonon-cavity effects in graphene despite modest Q factor (∼100).
  • Observed mechanical lasing (amplification into parametric instability).
  • Achieved cooling of Brownian motion via cavity sideband excitation.

Conclusions:

  • Graphene is a promising platform for room-temperature nonlinear mechanics.
  • Tunable nonlinear phenomena in graphene offer insights into cavity optomechanics analogues.
  • This work paves the way for all-mechanical cavity optomechanics research.