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High-quality-factor viscoelastic nanomechanical resonators from moiré superlattices
Qin-Yang Zeng1,2, Gui-Xin Su1, Ai-Sheng Song3
1State Key Laboratory of Semiconductor Physics and Chip Technologies, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, 100083, China.
Nature Communications
|April 22, 2025
Summary
Moiré superlattices in twisted bilayer graphene exhibit polymer-like viscoelasticity, leading to controllable hysteretic vibrations and enhanced mechanical quality factors. This discovery opens new avenues for nanoelectromechanical systems.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanotechnology
Background:
- Moiré superlattices in van der Waals materials display emergent phenomena like superconductivity.
- Viscoelasticity, combining elastic and viscous properties, has not been explored in nanomechanical resonators.
- Twisted bilayer graphene offers a tunable platform for studying moiré effects.
Purpose of the Study:
- To investigate the role of viscoelasticity in nanomechanical vibrations of twisted bilayer graphene.
- To explore the potential of moiré superlattices for viscoelasticity engineering.
- To observe emergent nanoelectromechanical couplings.
Main Methods:
- Fabrication of twisted bilayer graphene membranes.
- Measurement of nanomechanical vibrations and their hysteretic response.
- Characterization of mechanical quality factors (Q) at room temperature.
Main Results:
- Demonstrated controllable hysteretic response in nanomechanical vibrations, attributed to viscoelasticity.
- Measured exceptionally high mechanical quality factors (Q ~1900) at room temperature.
- Observed dissipation dilution, enhanced by the viscoelastic properties of the moiré superlattice.
Conclusions:
- Moiré superlattices can exhibit polymer-like viscoelasticity, influencing nanomechanical resonator dynamics.
- Twisted bilayer graphene serves as a promising system for engineering viscoelasticity and exploring nanoelectromechanical couplings.
- The findings suggest potential applications in advanced quantum optomechanical systems and novel resonator designs.
