About the cover

September 2016 Volume 11 No 9

Nanomechanical devices are of interest for studying fundamental physics in the quantum regime and for mass sensing. Graphene-based resonators exhibit high resonant frequencies, multiple mechanical modes and low mass. Using low-tension graphene drums, Mandar Deshmukh and colleagues modulate the tension-mediated nonlinear coupling between various modes of a drum resonator in a controllable manner — leading to transfer of energy between modes. They demonstrate the ability to amplify the motional amplitude in the resonator, thus making it attractive for a wide variety of applications. The cover image is an artist's impression of the dynamical coupling between two modes of a drum and the energy transfer that occurs as a result of the coupling.

Letter p747

IMAGE: ELLA MARUSHCHENKO

COVER DESIGN: BETHANY VUKOMANOVIC