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Article Dans Une Revue Physical Review Letters Année : 2015

Mechanical Signatures of the Current Blockade Instability in Suspended Carbon Nanotubes

Résumé

Transport measurements allow sensitive detection of nanomechanical motion of suspended carbon nanotubes. It has been predicted that when the electro-mechanical coupling is sufficiently large a bistability with a current blockade appears. Unambiguous observation of this transition by current measurements may be difficult. Instead, we investigate the mechanical response of the system, namely the displacement spectral function; the linear response to a driving; and the ring-down behavior. We find that by increasing the electro-mechanical coupling the peak in the spectral function broadens and shifts at low frequencies while the oscillator dephasing time shortens. These effects are maximum at the transition where non-linearities dominate the dynamics. These strong signatures open the way to detect the blockade transition in devices currently studied by several groups.
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hal-01178253 , version 1 (17-07-2015)

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G. Micchi, R. Avriller, F. Pistolesi. Mechanical Signatures of the Current Blockade Instability in Suspended Carbon Nanotubes. Physical Review Letters, 2015, 115 (20), pp.206802 (1-5). ⟨10.1103/PhysRevLett.115.206802⟩. ⟨hal-01178253⟩

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