FIG. 3: Bifurcation diagram for x as a function of the period of p ( t ). The data correspond to the same CNT oscillator and conditions of Fig. 2 (b). outer tubes. The inner tube length significantly affects the bifurcation diagrams and, con- sequently, the necessary driven periods for regular motions. The thermal gradient greatly influences the overall behavior of the CNT oscillator since, for relatively high values of dT/dx , the acceleration of the inner tube can be so high that it could be ejected, destroying the nanodevice. For long outer tubes ( ∼ 1 µ m), the inner tube can reach a steady velocity state which can change the system dynamics, not allowing periodic motions that cover all the outer tube (Fig. 4 (b)) [29]. From the practical point of view, very long outer tubes will be strongly influenced by off-axis tube oscillations. Preliminary MD simulations of models for the nanodevice shown in Fig. 1 indicated high amplitude off-axis oscillations of the outer tube when its extremities are not clamped. On the other hand, clamped extremities (e.g., 7