3 years ago

Orbital symmetry and the optical response of single-layer monochalcogenides.

Steven G. Louie, Diana Y. Qiu, Gabriel Antonius

The absorption spectra of single-layer GaSe and GaTe in the hexagonal phase feature exciton peaks with distinct polarization selectivity. We investigate these distinct features from first-principle calculations using the GW-BSE formalisms. We show that the brightness of the exciton absorption peaks is tunable with the polarization of the light. Due to the symmetry of the bands under z-axis mirror symmetry, the bound exciton states selectively couple to either in-plane or out-of-plane polarization of the light. In particular, for a p-polarized light absorption experiment, the absorption peaks of the s-like excitons emerge at large angle of incidence, while the overall absorbance reduces over the rest of the spectrum.

Publisher URL: http://arxiv.org/abs/1711.02713

DOI: arXiv:1711.02713v1

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