Phonon-Photon Mapping in a Color Center in Hexagonal Boron Nitride.
We report on the ultraviolet optical response of a color center in hexagonal boron nitride. We demonstrate a mapping between the vibronic spectrum of the color center and the phonon dispersion in hexagonal boron nitride, with a striking suppression of the phonon assisted emission signal at the energy of the phonon gap. By means of nonperturbative calculations of the electron-phonon interaction in a strongly anisotropic phonon dispersion, we reach a quantitative interpretation of the acoustic phonon sidebands from cryogenic temperatures up to room temperature. Our analysis provides an original method for estimating the spatial extension of the electronic wave function in a point defect.
Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, 34095 Montpellier, France.
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Vuong
Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, 34095 Montpellier, France.
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Cassabois
Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, 34095 Montpellier, France.
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Valvin
Laboratoire de Photonique et de Nanostructures (CNRS-LPN), Route de Nozay, 91460 Marcoussis, France.
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Ouerghi
Laboratoire Pierre Aigrain, Ecole Normale Supérieure, Université Paris Diderot, UPMC, CNRS UMR8551, 24 rue Lhomond, 75005 Paris, France.
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Chassagneux
Laboratoire Pierre Aigrain, Ecole Normale Supérieure, Université Paris Diderot, UPMC, CNRS UMR8551, 24 rue Lhomond, 75005 Paris, France.
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Voisin
Laboratoire Charles Coulomb, UMR 5221 CNRS-Université de Montpellier, 34095 Montpellier, France.
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Gil