Strong and tunable mode coupling in carbon nanotube resonators

  • Castellanos-Gomez A
  • Meerwaldt H
  • Venstra W
 et al. 
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The nonlinear interaction between two mechanical resonances of the same freely suspended carbon nanotube resonator is studied. We find that, in the Coulomb-blockade regime, the nonlinear modal interaction is dominated by single-electron-tunneling processes and that the mode-coupling parameter can be tuned with the gate voltage, allowing both mode-softening and mode-stiffening behaviors. This is in striking contrast to tension-induced mode coupling in strings where the coupling parameter is positive and gives rise to a stiffening of the mode. The strength of the mode coupling in carbon nanotubes in the Coulomb-blockade regime is observed to be 6 orders of magnitude larger than the mechanical-mode coupling in micromechanical resonators.

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  • Andres Castellanos-Gomez

  • Harold B. Meerwaldt

  • Warner J. Venstra

  • Herre S J Van Der Zant

  • Gary A. Steele

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