Journal
NANO LETTERS
Volume 19, Issue 9, Pages 5862-5867Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.9b01219
Keywords
NEMS; nano resonator; optomechanics; cooperativity; strong coupling; parametric pumping
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Funding
- Nano Mission, Department of Science and Technology (DST), India [SR/NM/NS-1157/2015(G), SR/NMITP-62/2016(G)]
- Board of Research in Nuclear Sciences (BRNS), India [37(3)/14/25/2016-BRNS]
- CSIR, India
- Ministry of Electronics and Information Technology (MeitY), India
- MHRD
- MeitY
- DST Nano Mission
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Coupling between a mechanical resonator and optical cavities, microwave resonators, or other mechanical resonators have been used to observe interesting effects from sideband cooling to coherent manipulation of phonons. Here we demonstrate strong coupling between different vibrational modes of MoS2 drum resonators at room temperature. We observe intermodal as well as intramodal coupling. Cooperativity, a measure of coupling between the two modes, can be tuned by more than an order of magnitude by changing the direct current gate bias. The large measured cooperativity of about 900 at room temperature indicates that the phonon population can be coherently transferred between the modes for more than 500 cycles. This coherent oscillation is of great interest in studying quantum effects in macroscopic objects.
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