%ALee, Jaesung%ALee, Jaesung [Department of Electrical and Computer Engineering, Herbert Wertheim College of Engineering, University of Florida, Gainesville, Florida 32611, USA]%AFeng, Philip%AFeng, Philip [Department of Electrical and Computer Engineering, Herbert Wertheim College of Engineering, University of Florida, Gainesville, Florida 32611, USA]%BJournal Name: Applied Physics Letters; Journal Volume: 119; Journal Issue: 24; Related Information: CHORUS Timestamp: 2023-06-18 11:57:15 %D2021%IAmerican Institute of Physics %JJournal Name: Applied Physics Letters; Journal Volume: 119; Journal Issue: 24; Related Information: CHORUS Timestamp: 2023-06-18 11:57:15 %K %MOSTI ID: 10361180 %PMedium: X %TSelf-sustaining MoS2 nanomechanical oscillators and feedback cooling %X

We report on the experimental demonstration of self-sustaining feedback oscillators referenced to ultrathin molybdenum disulfide (MoS2) nanomechanical resonators vibrating in the ∼10 to 20 MHz range. Based on comprehensive open-loop characterization of MoS2 resonators with dynamic ranges up to 85 dB, self-sustaining oscillators are constructed by incorporating the MoS2 resonators into an optoelectronic feedback circuitry. The prototyped MoS2 self-sustaining oscillators generate stable radio frequency waveforms with frequency stability (measured in Allan deviation) down to ∼2 × 10−5 and phase noise mainly limited by electronic thermal noise. Beyond self-sustaining oscillations, we demonstrate feedback cooling of thermomechanical motion of a bilayer (2L) MoS2 resonator from 300 K to 255 K by tuning the phase in the feedback, suppressing or “squashing” the noise level of the system.

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