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.
@article{arxiv.1701.04604,
title = {Direct and parametric synchronization of a graphene self-oscillator},
author = {S. Houri and S. J. Cartamil-Bueno and M. Poot and P. G. Steeneken and H. S. J. van der Zant and W. J. Venstra},
journal= {arXiv preprint arXiv:1701.04604},
year = {2017}
}