Version 2 2022-12-09, 14:06Version 2 2022-12-09, 14:06
Version 1 2022-12-08, 21:05Version 1 2022-12-08, 21:05
journal contribution
posted on 2022-12-09, 14:06authored byTahmid Kaisar, Jaesung Lee, Donghao Li, Steven W. Shaw, Philip X.-L. Feng
We
report on experimental measurements and quantitative analyses
of nonlinear dynamic characteristics in ultimately thin nanomechanical
resonators built upon single-layer, bilayer, and trilayer (1L, 2L,
and 3L) molybdenum disulfide (MoS2) vibrating drumhead
membranes. This synergistic study with calibrated measurements and
analytical modeling on observed nonlinear responses has led to the
determination of nonlinear damping and stiffness coefficients at cubic and quintic orders for these two-dimensional
(2D) resonators operating in the very high frequency (VHF) band (up
to ∼90 MHz). We find that the quintic force
can be ∼20% of the Duffing force at larger amplitudes, and
thus, it generally cannot be ignored in a nonlinear dynamics analysis.
This study provides the first quantification of nonlinear damping
and frequency detuning characteristics in 2D semiconductor nanomechanical
resonators and elucidates their origins and dependency on engineerable
parameters, setting a foundation for future exploration and utilization
of the rich nonlinear dynamics in 2D nanomechanical systems.