Figure 1

The proposed nanomotor (a) and nanodrill (b) formed from an inner $(6,4)$ CNT (red) and an outer $(18,0)$ CNT (light gray). The nanomotor is attached to gold electrodes, which act as reservoirs of electrons, whereas the nanodrill has one end contacted to a mercury electrode.Reuse & Permissions

Figure 2

(a) The tangential force ($F_{\mathrm{motor}}$) exerted on a $(18,0)@(6,4)$ nanodrill as a function of the voltage $\varphi$. (b) The black curve shows the computed tangential force per volt $f_{\mathrm{motor}}(E)$ for the $(18,0)@(6,4)$ drill, whose integral yields the curve in Fig. 1a, in accordance with Eq. (7). For comparison, the red or light gray curve shows the quantity $f_{\infty }^{(6,4)}(E)$ of Eq. (12), which is proportional to the total tangential velocity carried by all right-moving channels of energy $E$ in an infinite $(6,4)$ chiral CNT. (c) A “fan diagram” showing the tangential velocities $v_x^{(6,4)}\mathbf{(}q,k_y(q,E)\mathbf{)}/v_F$ carried by right-moving channels $q$ (red or light gray) and left-moving channels $q^{\prime }$ (blue or dark gray) of an infinite $(6,4)$ chiral CNT. The red or light gray curves sum to yield the red or light gray curve of (b), in accordance with Eq. (10).Reuse & Permissions