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Quenching of low-energy optical absorption in bilayer <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:mi mathvariant="normal">N</mml:mi></mml:math> polytypes
In this work we provide a first-principles description of the electronic and optical properties of bilayers ${\mathrm{C}}_{3}\mathrm{N}$, with different stacking motifs AB, $\mathrm{AB}\ensuremath{'}$, and $\mathrm{AA}\ensuremath{'}$. Starting from quasiparticle electronic band structures, we solve the Bethe-Salpeter equation (BSE) to access the excitonic properties of these bilayers. For all stacking sequences, we …