Signatures of the Current Blockade Instability in Suspended Carbon Nanotubes

Abstract

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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Cited by in corpus (26)

• Mesoscopic physics of nanomechanical systems
• A coherent nanomechanical oscillator driven by single-electron tunnelling
• Ultrasensitive Displacement Noise Measurement of Carbon Nanotube Mechanical Resonators
• Nonlinear nanomechanical resonators approaching the quantum ground state
• Proposal for a nanomechanical qubit
• Real-time measurement of nanotube resonator fluctuations in an electron microscope
• Dynamical multistability in a quantum-dot laser
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• Full Electrostatic Control of Nanomechanical Buckling
• Ultrastrong coupling between electron tunneling and mechanical motion
• Electro-Mechanical Transition in Quantum dots
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• Strong vibration nonlinearity in semiconductor-based nanomechanical systems
• Sensitivity of the mixing current technique to detect nano-mechanical motion
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• Steady-state Peierls transition in nanotube quantum simulator
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• Fine structure of current noise spectra in nanoelectromechanical resonators