Geometric structure of the (9,0)-(18,0) zigzag DWCNTs. The inner and the outer nanotubes, respectively, correspond to the heavy and the light solid curves.
Band structures without the intertube interactions at (a) and (c) ; those with the intertube interactions at (b) and (d) .
Magnetic-flux-dependent energy gap in the (a) absence or (b) presence of the intertube interactions.
Density of states at and in the (a) absence or (b) presence of the intertube interactions. The inset in (a) shows the details near the Fermi level.
Same plot as Fig. 4, but shown for joint density of states.
Optical absorption spectra, (a) without or (b) with the intertube interactions at and . Also shown in (a) for clarity are those near the threshold absorption spectra.
Absorption frequencies at (a) the moderate-frequency range; those at the low-frequency range in the (b) absence or (c) presence of the intertube interactions.
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