A theoretical investigation of electronic and optical properties of (6,1) single-wall carbon nanotube (SWCNT)
2020
We report the comparative study of electronic and optical properties of (6,1) SWCNT from GGA and DFT-1/2 methods. (6,1) SWCNT is a low-bandgap semiconductor, which falls within (
$$n_1-n_2$$
)/3
$$\ne \,$$
integer. The calculated bandgaps are 0.371 eV and 0.462 eV from GGA and DFT-1/2, respectively. Thus, DFT-1/2 enhanced the electronic bandgap by 24.52%. From both GGA and DFT-1/2 approaches (6,1) SWCNT exhibits an indirect bandgap along
$$\Gamma -\Delta$$
symmetry. However, the percentage change in direct–indirect bandgap is negligibly small, i.e., 4.1% and 3.7% from GGA and DFT-1/2, respectively. The refractive index measured along x-axis (
$$n_{x}$$
) approaches unity, indicating transparent behaviour, while that along z-axis (
$$n_{z}$$
) goes as high as
$$\sim$$
3.82 for photon energy
$$0.0-0.15$$
eV, exhibiting opaque behaviour. Again, the value of
$$n_z$$
drops below unity at photon energy
$$\sim$$
0.18 eV and again approaches
$$\sim$$
1 for higher energy ranges. The optical absorption is highly anisotropic and active within the infrared region.
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