Direct and parametric synchronization of a graphene self-oscillator

  • S. Houri
    Delft University of Technology 1 Kavli Institute of Nanoscience, , Lorentzweg 1, 2628 CJ Delft, The Netherlands
  • S. J. Cartamil-Bueno
    Delft University of Technology 1 Kavli Institute of Nanoscience, , Lorentzweg 1, 2628 CJ Delft, The Netherlands
  • M. Poot
    Delft University of Technology 1 Kavli Institute of Nanoscience, , Lorentzweg 1, 2628 CJ Delft, The Netherlands
  • P. G. Steeneken
    Delft University of Technology 1 Kavli Institute of Nanoscience, , Lorentzweg 1, 2628 CJ Delft, The Netherlands
  • H. S. J. van der Zant
    Delft University of Technology 1 Kavli Institute of Nanoscience, , Lorentzweg 1, 2628 CJ Delft, The Netherlands
  • W. J. Venstra
    Quantified Air 2 , Lorentzweg 1, 2628 CJ Delft, The Netherlands

抄録

<jats:p>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.</jats:p>

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