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Accueil du site > Séminaires > 19/04/2010 : Spectral gaps for light in a periodic ensemble of ultracold atoms
ATTENTION : Cette page est obsolète suite à la création au 1er janvier 2011 d’un nouveau Laboratoire de Physique à Montpellier : le Laboratoire Charles Coulomb
19/04/2010 : Spectral gaps for light in a periodic ensemble of ultracold atoms
By Mauro Antezza post doc au laboratoire Kastler Brossel de l’Ecole Normale Superieure
We study the dispersion relation of light in a periodic ensemble of atoms. We develop a general theory valid for all periodic lattices, includig the atomic quantum motion, and properly renormalized. Whereas no omnidirectional spectral gap is known for light in a Bravais atomic lattice, we find that an omnidirectional gap occurs in a diamond atomic lattice. As a side result we solve a previous controversy on the occurrence of an omnidirectional gap in a cubic lattice.
