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Title: Time-domain response of atomically thin MoS{sub 2} nanomechanical resonators

We measure the energy relaxation rate of single- and few-layer molybdenum disulphide (MoS{sub 2}) nanomechanical resonators by detecting the resonator ring-down. Recent experiments on these devices show a remarkably low quality (Q)-factor when taking spectrum measurements at room temperature. The origin of the low spectral Q-factor is an open question, and it has been proposed that besides dissipative processes, frequency fluctuations contribute significantly to the resonance line-width. The spectral measurements performed thus far however, do not allow one to distinguish these two processes. Here, we use time-domain measurements to quantify the dissipation. We compare the Q-factor obtained from the ring-down measurements to those obtained from the thermal noise spectrum and from the frequency response of the driven device. In few-layer and single-layer MoS{sub 2} resonators, the two are in close agreement, which demonstrates that the spectral line-width in MoS{sub 2} membranes at room temperature is limited by dissipation, and that excess spectral broadening plays a negligible role.
Authors:
; ; ; ;  [1]
  1. Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft (Netherlands)
Publication Date:
OSTI Identifier:
22311192
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; FLUCTUATIONS; LAYERS; LINE BROADENING; LINE WIDTHS; MEMBRANES; MOLYBDENUM SULFIDES; NANOSTRUCTURES; NOISE; RELAXATION; RESONANCE; RESONATORS; SPECTRA; TEMPERATURE RANGE 0273-0400 K