Electronic Structure and Optical Absorption of Fluorographene

Details Electronic Structure and Optical Absorption of Fluorographene Electronic Structure and Optical Absorption of Fluorographene

2011-08-28

arxiv.org/abs/1108.5511v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 5 figures; MRS Proceedings (2011), 1370

Scientific paper

10.1557/opl.2011.894

A first-principles study on the quasiparticles energy and optical absorption spectrum of fluorographene is presented by employing the GW + Bethe-Salpeter Equation (BSE) method with many-electron effects included. The calculated band gap is increased from 3.0 eV to 7.3 eV by the GW approximation. Moreover, the optical absorption spectrum of fluorographene is dominated by enhanced excitonic effects. The prominent absorption peak is dictated by bright resonant excitons around 9.0 eV that exhibit a strong charge transfer character, shedding light on the exciton condensation and relevant optoelectronic applications. At the same time, the lowest-lying exciton at 3.8 eV with a binding energy of 3.5 eV is identified, which gives rise to explanation of the recent ultraviolet photoluminescence experiment.

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