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Schematic representation of a nanodevice used to allow starting and controlling a CNT oscillator. The device is suspended between two contacts and it is composed by a X-like junction, which serves as support and also provides the outer tube of the oscillator, and an inner moveable tube.
(a) Time evolution of the inner tube obtained from MD simulations for thermal gradients of 7 and 17 K/nm. The fittings using Eq. (1) are also presented. (b) Time evolution of the inner tube center of mass obtained from numerical integration of Eq. (1) for two different situations with . Curve 1 represents the case where the thermal gradient is “turned on” in the beginning of the process and kept on this state, or equivalently, making . Curve 2 displays the case where a driven periodic pulse with a period of 400 ps (represented by the curve 3) is used.
Bifurcation diagram for as a function of the period of . The data correspond to the same CNT oscillator and conditions of Fig. 2(b).
Time evolution of the inner tube obtained from Eq. (1) for three values of driven period: (a) 290, (b) 320, and (c) 500 ps. The data correspond for the same CNT oscillator and conditions of Fig. 2(b). The oscillation frequency for the cases (a) and (b) are 3.4 and 1.6 GHz, respectively.
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