Kavli Affiliate: Herre S. J. Van Der Zant
| First 5 Authors: Hanqing Liu, Gabriele Baglioni, Carla B. Constant, Herre S. J. van der Zant, Peter G. Steeneken
| Summary:
The high susceptibility of ultrathin two-dimensional (2D) material resonators
to force and temperature makes them ideal systems for sensing applications and
exploring thermomechanical coupling. Although the dynamics of these systems at
high stress has been thoroughly investigated, their behavior near the buckling
transition has received less attention. Here, we demonstrate that the force
sensitivity and frequency tunability of 2D material resonators are
significantly enhanced near the buckling bifurcation. This bifurcation is
triggered by compressive displacement that we induce via thermal expansion of
the devices, while measuring their dynamics via an optomechanical technique. We
understand the frequency tuning of the devices through a mechanical buckling
model, which allows to extract the central deflection and boundary compressive
displacement of the membrane. Surprisingly, we obtain a remarkable enhancement
of up to 14x the vibration amplitude attributed to a very low stiffness of the
membrane at the buckling transition, as well as a high frequency tunability by
temperature of more than 4.02 %/K. The presented results provide insights into
the effects of buckling on the dynamics of free-standing 2D materials and
thereby open up opportunities for the realization of 2D resonant sensors with
buckling-enhanced sensitivity.
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