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arXiv · 1701.04604

Direct and parametric synchronization of a graphene self-oscillator

S. Houri·S. J. Cartamil-Bueno·M. Poot·P. G. Steeneken·H. S. J. van der Zant·W. J. Venstra
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Abstract

We explore the dynamics of a graphene nanomechanical oscillator coupled to a reference oscillator. Circular graphene drums are forced into self-oscillation, at a frequency fosc, by means of photothermal feedback induced by illuminating the drum with a continuous-wave red laser beam. Synchronization to a reference signal, at a frequency fsync, is achieved by shining a power-modulated blue laser onto the structure. We investigate two regimes of synchronization as a function of both detuning and signal strength for direct (fsync = fosc) and parametric locking (fsync = 2fosc). We detect a regime of phase resonance, where the phase of the oscillator behaves as an underdamped second-order system, with the natural frequency of the phase resonance showing a clear power-law dependence on the locking signal strength. The phase resonance is qualitatively reproduced using a forced van der Pol-Duffing-Mathieu equation.

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S. Houri, S. J. Cartamil-Bueno, M. Poot, P. G. Steeneken, H. S. J. van der Zant, W. J. Venstra. 2017-01-17. Direct and parametric synchronization of a graphene self-oscillator. https://doi.org/10.1063/1.4976310

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