"Extreme mechanical tunability in suspended MoS2 resonator controlled b" by Anis Chiout, Cléophanie Brochard-Richard et al.
 

Extreme mechanical tunability in suspended MoS2 resonator controlled by Joule heating

Document Type

Article

Publication Date

12-1-2023

Abstract

Nanomechanical resonators are built into phones, as filters or accelerometers, but they lack a knob to effectively tune the frequency at the nanoscale when it’s easy to tune on an octave the tone of a classical musical instrument like a guitar string. Moreover, the control of deformation in nanomaterials, as two-dimensional (2D) materials, to tailor their electronic properties, i.e., straintronic, opens up avenues for applications in force detection, bolometry or quantum emitters. An accurate control of the deformation within these materials is thus necessary to fully exploit their potential. The precise study of deformations in 2D materials involves measurements of vibration modes and nanomechanics. By using a suspended MoS2 membrane heated by the Joule effect, we induce a strong softening of the mechanical resonance frequency as a function of the electrothermal heating, over one octave. A simple electrical tension is used to modulate the thermal mechanical tuning. Its amplitude is very large, greater than 100% modulation for one volt, compared to other approaches on 2D or 1D materials and, moreover, a very wide frequency range is accessible. Finally, we have related a photo-induced softening of the membrane over very long times with the current measurements and a photothermal effect.

Identifier

85151367108 (Scopus)

Publication Title

Npj 2d Materials and Applications

External Full Text Location

https://doi.org/10.1038/s41699-023-00383-3

e-ISSN

23977132

Issue

1

Volume

7

Grant

MRSEC DMR−1720530

Fund Ref

National Science Foundation

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