title: Anomalous Doppler-effect and polariton-mediated cooling of two-level atoms.
abstract: We consider an atom moving in a near resonant laser field with its dipole strongly coupled to a resonator field mode. As compared to the standard Doppler shift, we find a substantially different and counterintuitive linear velocity dependence of the light scattering properties. The mechanical force of the laser field exhibits strong velocity selectivity at a polariton resonance, which gives rise to an enhanced friction force and Doppler cooling even in the directions perpendicular to the resonator axis. This effect allows for sub-Doppler cooling of atoms even with a nondegenerate ground state.
authors.affiliation: Research Institute for Solid State Physics and Optics, P. O. Box 49, H-1525 Budapest, Hungary.
authors.forename: Peter
authors.initials: P
authors.lastname: Domokos
authors.forename: András
authors.initials: A
authors.lastname: Vukics
authors.forename: Helmut
authors.initials: H
authors.lastname: Ritsch