Abstract
We explore fluctuation induced switching in an underdamped micromechanical torsionaloscillator driven far from equilibrium. Under a sufficiently strong periodic driving field, theoscillator possesses multiple stable dynamical states. Depending on whether the device isresonantly or parametrically driven, two different types of bifurcation occur. In thepresence of noise, the oscillator is induced to switch from one dynamical state into theother. Near the bifurcation points, the activation barrier exhibits a power lawdependence on the frequency detuning. The critical exponents are measured tobe different for the two types of bifurcation. Both values are in agreement withtheoretical predictions. Such scaling of the activation barrier close to the bifurcationpoint is expected to occur in all systems that are driven away from equilibrium.
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