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Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
Published on: July 24, 2015
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Tunable phonon-cavity coupling in graphene membranes.
R De Alba1, F Massel2, I R Storch1
1Department of Physics, Cornell University, Ithaca, New York 14853, USA.
Nature Nanotechnology
|June 14, 2016
Summary
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.
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.
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