title: Observation of Single-Photon Superradiance and the Cooperative Lamb Shift in an Extended Sample of Cold Atoms.
abstract: We report direct, time-resolved observations of single-photon superradiance in a highly extended, elliptical sample of cold ^{87}Rb atoms. The observed rapid decay rate is accompanied by its counterpart, the cooperative Lamb shift. The rate of the strongly directional decay, and the associated shift, scale linearly with the number of atoms, demonstrating the collective nature of the observed quantities.
authors: Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA.
authors: S J
authors: SJ
authors: Roof
authors: Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA.
authors: K J
authors: KJ
authors: Kemp
authors: Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA.
authors: M D
authors: MD
authors: Havey
authors: Department of Theoretical Physics, State Polytechnic University, 195251 St.-Petersburg, Russia and Institute for Analytical Instrumentation, Russian Academy of Sciences, 198103 St.-Petersburg, Russia.
authors: I M
authors: IM
authors: Sokolov