  Here, we demonstrate the fabrication of single-layer MoS2 mechanical
resonators. The fabricated resonators have fundamental resonance frequencies in
the order of 10 MHz to 30 MHz (depending on their geometry) and their quality
factor is about ~55 at room temperature in vacuum. The dynamical properties
clearly indicate that monolayer MoS2 membranes are in the membrane limit (i.e.,
tension dominated), in contrast to their thicker counterparts, which behave as
plates. We also demonstrate clear signatures of nonlinear behaviour of our
atomically thin membranes, thus providing a starting point for future
investigations on the nonlinear dynamics of monolayer nanomechanical
resonators.
