Collective Effects in Matter-Wave Emission

Ultracold atoms in state-selective optical lattices open a new window for the study of quantum-optical phenomena [1], allowing for the experimental observation of Lamb shifts, non-Markovian decay, bound-state beats, and polaritons. In this talk, we discuss the connection between matter-wave polariton formation and collective radiative phenomena, including super/subradiance, timed Dicke states, and directional emission; and we give an outlook on possible experiments.