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Tunable Exciton-Optomechanical Coupling in Suspended Monolayer MoSe2
Hongchao Xie1,2, Shengwei Jiang1, Daniel A Rhodes3
1Laboratory of Atomic and Solid State Physics and School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States.
Nano Letters
|March 15, 2021
Summary
Researchers observed gate-tunable exciton-optomechanics in monolayer molybdenum diselenide (MoSe2) mechanical resonators. This light-matter interaction demonstrates optical damping, antidamping, and spring effects, paving the way for novel nanoelectromechanical systems.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Monolayer transition metal dichalcogenide (TMD) semiconductors exhibit strong excitonic effects, leading to phenomena like exciton-polaritons and atomic monolayer mirrors.
- Strong light-matter interactions in TMDs offer potential for dynamical control of mechanical motion via exciton resonance.
Purpose of the Study:
- To investigate and report the observation of exciton-optomechanical coupling in a suspended monolayer MoSe2 mechanical resonator.
- To explore the gate-tunability of exciton-optomechanical coupling and understand the underlying physical mechanisms.
Main Methods:
- Utilized moderate optical pumping near the exciton resonance of a suspended monolayer MoSe2 mechanical resonator.
- Investigated mechanical vibrations, optical damping, antidamping, and the optical spring effect.
- Employed gate voltage modulation to tune the exciton-optomechanical coupling strength.
Main Results:
- Successfully observed exciton-optomechanical coupling in the MoSe2 mechanical resonator.
- Demonstrated optical damping, optical antidamping, and the optical spring effect.
- Confirmed that the exciton-optomechanical coupling strength is tunable via gate voltage.
Conclusions:
- The observed phenomena can be explained by a model involving photothermal backaction and gate-induced mirror symmetry breaking.
- Gate-tunable exciton-optomechanical coupling in monolayer semiconductors holds promise for applications in nanoelectromechanical systems (NEMS) and exciton-optomechanics.
Keywords:
NEMS devicesexciton-optomechanical couplinggate-tunable photothermal backactionsuspended monolayer semiconductorsMore Related Videos
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