Gigahertz multimode vibrations in graphene and MoS<sub>2</sub> nanomechanical resonators at room temperature.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41686903.
- Also identified by DOI 10.1126/sciadv.ads5668 and PMC identifier 12904198.
- Licence recorded as CC BY-NC.
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Abstract
Probing and understanding ultrahigh-frequency/gigahertz (UHF/GHz) vibrations in atomic layer nanomechanical resonators holds strong promise for fundamental studies and technological applications, such as sensing, signal processing, and quantum engineering. However, accessing GHz flexural-mode resonances in such devices at room temperature has been challenging. Here, we demonstrate the first measurement of GHz flexural vibrations in graphene and molybdenum disulfide (MoS<sub>2</sub>) resonators at room temperature, achieving multimode resonances (<i>f</i><sub><i>m</i>,<i>n</i></sub>) up to ~1.09 GHz and quality factors (<i>Q</i><sub><i>m</i>,<i>n</i></sub>) up to ~5400 in multilayer MoS<sub>2</sub> resonators, and <i>f</i><sub><i>m</i>,<i>n</i></sub> up to ~1.03 GHz with high <i>Q</i><sub><i>m</i>,<i>n</i></sub> ~4500 in few-layer graphene resonators. Both <i>f</i>s and <i>Q</i>s are the highest among reported atomic layer nanomechanical resonators at room temperature, yielding <i>f</i><sub><i>m</i>,<i>n</i></sub> × <i>Q</i><sub><i>m</i>,<i>n</i></sub> ~ 5 × 10<sup>12</sup> Hz. We also reveal a <i>Q</i> scaling law with higher modes, which favors detecting GHz resonances. This study will enable exploiting multiple modes in atomic layer resonators toward resonant sensing and transduction functions at UHF/GHz.