Deviation from the normal mode expansion in a coupled graphene-nanomechanical system

@article{Schwarz2016DeviationFT,
  title={Deviation from the normal mode expansion in a coupled graphene-nanomechanical system},
  author={Cornelia S Schwarz and Benjamin Pigeau and Laure Mercier de Lépinay and Aur'elien Kuhn and D. Kalita and Nedjma Bendiab and La{\"e}titia Marty and Vincent Bouchiat and Olivier Arcizet},
  journal={Physical review applied},
  year={2016},
  volume={6},
  pages={064021}
}
We optomechanically measure the vibrations of a nanomechanical system made of a graphene membrane suspended on a silicon nitride nanoresonator. When probing the thermal noise of the coupled nanomechanical device, we observe a significant deviation from the normal mode expansion. It originates from the heterogeneous character of mechanical dissipation over the spatial extension of coupled eigenmodes, which violates one of the fundamental prerequisite for employing this commonly used description… 

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