Abstract
The optical properties of zigzag and armchair boron nitride nanoribbons (BNNRs) are investigated via a GW-Bethe-Salpeter equation approach. The reduced dimensionality and large band gaps of the BNNRs significantly enhance the exciton binding energies up to several eV. Many-body effects dramatically reshape the absorption spectra and excitonic peaks dominate the spectra. Moreover, the absorption spectra of zigzag BNNRs distinctly differ from those of armchair BNNRs, which can be as a signature to distinguish these two kinds of BNNRs experimentally. Dark excitons, stemming from dipole-forbidden transition, are also observed in BNNRs, which might greatly influence the luminescence yield of the system.
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