Symmetry breaking in a mechanical resonator made from a carbon nanotube

Eichler, Alexander; Moser, J.; Dykman, M. I.; Bachtold, Adrian

doi:10.1038/ncomms3843

Cited by 57 publications

(59 citation statements)

References 41 publications

(86 reference statements)

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“…It should also be noted that an asymmetric beam shape in doubly clamped beams of nanometric dimensions is by no means an uncommon phenomena. In CNT resonators, it has been recently shown that such asymmetries are responsible for some particular features of their electromechanical response 31 . In the case of Si beams, top-down fabrication methods can be engineered to predetermine the amount of beam deflection at rest to target specific read-out signal levels.…”

Section: Discussionmentioning

confidence: 99%

High-sensitivity linear piezoresistive transduction for nanomechanical beam resonators

et al. 2014

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Highly sensitive conversion of motion into readable electrical signals is a crucial and challenging issue for nanomechanical resonators. Efficient transduction is particularly difficult to realize in devices of low dimensionality, such as beam resonators based on carbon nanotubes or silicon nanowires, where mechanical vibrations combine very high frequencies with miniscule amplitudes. Here we describe an enhanced piezoresistive transduction mechanism based on the asymmetry of the beam shape at rest. We show that this mechanism enables highly sensitive linear detection of the vibration of low-resistivity silicon beams without the need of exceptionally large piezoresistive coefficients. The general application of this effect is demonstrated by detecting multiple-order modes of silicon nanowire resonators made by either top-down or bottom-up fabrication methods. These results reveal a promising approach for practical applications of the simplest mechanical resonators, facilitating its manufacturability by very large-scale integration technologies.

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Section: Discussionmentioning

confidence: 99%

High-sensitivity linear piezoresistive transduction for nanomechanical beam resonators

et al. 2014

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“…It has been proposed that low Q factors could originate from thermally induced spectral broadening 19 , clamping losses [20][21][22] or from symmetry breaking 23 . Until now, reports of the quality factor in CNTs have been based only on spectral measurements 14,18,24 .…”

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confidence: 99%

Observation of decoherence in a carbon nanotube mechanical resonator

et al. 2014

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In physical systems, decoherence can arise from both dissipative and dephasing processes. In mechanical resonators, the driven frequency response measures a combination of both, whereas time-domain techniques such as ringdown measurements can separate the two. Here we report the first observation of the mechanical ringdown of a carbon nanotube mechanical resonator. Comparing the mechanical quality factor obtained from frequency-and time-domain measurements, we find a spectral quality factor four times smaller than that measured in ringdown, demonstrating dephasing-induced decoherence of the nanomechanical motion. This decoherence is seen to arise at high driving amplitudes, pointing to a nonlinear dephasing mechanism. Our results highlight the importance of time-domain techniques for understanding dissipation in nanomechanical resonators, and the relevance of decoherence mechanisms in nanotube mechanics.

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“…Considerable research is being conducted toward understanding the nonlinear dynamics of nanobeams, 5 nanotubes, nanowires, and graphene based resonators. 6 Moreover, various dynamical aspects in NEMS resonators, such as bifurcations, 7 nonlinear damping, 8 and chaos, 9 are studied to understand their characteristics and utilize them for real life applications.…”

Section: The Manuscriptmentioning

confidence: 99%

Exploiting nonlinearities of micro-machined resonators for filtering applications

Ilyas

Chappanda

Younis

2017

Applied Physics Letters

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We demonstrate the exploitation of the nonlinear behavior of two electrically coupled microbeam resonators to realize a band-pass filter. More specifically, we combine their nonlinear hardening and softening responses to realize a near flat pass band filter with sharp roll-off characteristics. The device is composed of two near identical doubly clamped and electrostatically actuated microbeams made of silicon. One of the resonators is buckled via thermal loading to produce a softening frequency response. It is then further tuned to create the desired overlap with the second resonator response of hardening behavior. This overlapping improves the pass band flatness. Also, the sudden jumps due to the softening and hardening behaviors create sharp roll-off characteristics. This approach can be promising for the future generation of filters with superior characteristics.

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Symmetry breaking in a mechanical resonator made from a carbon nanotube

Cited by 57 publications

References 41 publications

High-sensitivity linear piezoresistive transduction for nanomechanical beam resonators

High-sensitivity linear piezoresistive transduction for nanomechanical beam resonators

Observation of decoherence in a carbon nanotube mechanical resonator

Exploiting nonlinearities of micro-machined resonators for filtering applications

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