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Theory of phonon-assisted luminescence in solids: application to hexagonal boron nitride

Abstract : In this manuscript we study luminescence of hexagonal boron nitride (hBN) by means of non-equilibrium Green's functions plus time-dependent perturbation theory. We derive a formula for light emission in solids in the limit of a weak excitation that includes perturbatively the contribution of electron-phonon coupling at the first order. This formula is applied to study luminescence in bulk hBN. This material has attracted interest due to its strong luminescence in the ultraviolet [Watanabe et al., Nature Mat. 3, 404(2004)]. The origin of this luminescence has been widely discussed, but only recently has a clear signature of phonon mediated light emission emerged in the experiments [Cassabois et al., Nature Phot. 10, 262(2016)]. By means of our new theoretical approach we provide a clear and full explanation of light emission in hBN.
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https://hal-amu.archives-ouvertes.fr/hal-01852174
Contributor : Claudio Attaccalite <>
Submitted on : Wednesday, August 1, 2018 - 8:22:04 AM
Last modification on : Tuesday, August 18, 2020 - 2:30:02 PM

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Elena Cannuccia, B. Monserrat, Claudio Attaccalite. Theory of phonon-assisted luminescence in solids: application to hexagonal boron nitride. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2019, 99, pp.081109. ⟨10.1103/PhysRevB.99.081109⟩. ⟨hal-01852174⟩

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