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Self-detecting gate-tunable nanotube paddle resonators
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10.1063/1.2985859
/content/aip/journal/apl/93/11/10.1063/1.2985859
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/11/10.1063/1.2985859
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Figures

Image of FIG. 1.
FIG. 1.

(a) Schematics of a paddle resonator defining some of its characteristic parameters. is the offset of the center of mass of the paddle from the nanotube axis, is the length of the paddle parallel to the nanotube, and is the the width of the paddle (perpendicular to the nanotube). (b) Scanning electron micrograph of a typical device. (c) AM frequency mixing measurement scheme. A single generator is used to generate an AM signal, which is split and supplied to the source (attenuated) and gate electrode. The modulation frequency is the reference for a lock-in amplifier. The current flowing through the nanotube is converted into a voltage and detected by the lock-in amplifier input.

Image of FIG. 2.
FIG. 2.

Mixing-current amplitude (differentiated with respect to to make the resonances clearly visible) as function of the carrier frequency vs dc gate voltage for (a) device 1 and (b) device 2 . Multiple resonances are visible that move either to higher or lower frequencies as the gate voltage is increased. (c) Peak shape of a typical down-tuned resonance measured at for device 1 (gray squares). The fit parameters are a resonance frequency of , , and a background phase radians. The upper part depicts the relative phase vs carrier frequency. (d) Amplitude of a typical up-tuning resonance measured at for device 1. The fit parameters are a resonance frequency of , , and a background phase radians. Also for this mode a resonance is observed in the phase of the lock-in amplifier (upper gray curve).

Image of FIG. 3.
FIG. 3.

Resonance positions (points) extracted from the lock-in current as a function of carrier frequency vs dc gate voltage for device 1 (a) and 2 (b). The solid lines are fits of Eq. (5) to the datapoints in which and are the fit parameters.

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/content/aip/journal/apl/93/11/10.1063/1.2985859
2008-09-18
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Self-detecting gate-tunable nanotube paddle resonators
http://aip.metastore.ingenta.com/content/aip/journal/apl/93/11/10.1063/1.2985859
10.1063/1.2985859
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