Abstract
Abstract The excitonic effects and optical properties in the graphene-like hexagonal boron carbide (BC) monolayer investigated by ab-initio many-body calculations using GW approximation plus Bethe-Salpeter equation (BSE) approach. BSE calculations have been carried out on the base of G0W0 to integrate excitonic effects. We obtained that the planar BC has direct band gap with metallic character of 3.18 eV. The investigated optical absorption spectrum is dominated by discrete excitonic peaks due to the excitonic states having a noticeably low binding energy of 0.16 eV. The formation of such bound excitons is attributed to enhance electron-hole interaction in low-dimensional materials. By examining the oscillator strength of excitons with imaginary dielectric constant, we confirmed the high accuracy of the calculation. The graphene-like planar BC monolayer exhibit significantly strong and broad optical absorption in the ultraviolet region, which make it a promising candidate for nanoelectronics and optoelectronic applications.
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