Nonlinear Magnetotransport in Interacting Chiral Nanotubes

Nonlinear transport through interacting single-wall nanotubes containing a few impurities is studied theoretically. Extending the Luttinger liquid theory to incorporate trigonal warping and chirality effects, we derive the current contribution $I_e$ even in the applied voltage $V$ and odd in an orbital magnetic field $B$, which is nonzero only for chiral tubes and in the presence of interactions.

Figure 1

Even-in-voltage part of the current $I_e$ (in nA) as a function of bias voltage (in V) for several temperatures. Results are shown for a $(10,4)$ SWNT with $K=0.23$, $B=16\mathrm{T}$, containing two impurities ($L=20\mathrm{nm}$, $U_{1,2}=v/2$). Inset: Coefficient $\alpha (T)$ [in $\mu {\mathrm{SV}}^{-1}{\mathrm{T}}^{-1}$] defined in Eq. (1) as a function of temperature in double-logarithmic scales.