We present the results of an experiment on light scattering from an elongated Bose-Einstein condensate (BEC) interacting with a far-off-resonant pump laser. By collective atomic recoil lasing (CARL) a coherent superposition of two atomic wave packets with different momenta is created. Varying the intensity of a weak counterpropagating laser beam we observe the transition from the pure superradiant regime to the Bragg scattering regime, where Rabi oscillations in a two-level system are observed. The process is limited by the decoherence between the two atomic wave packets. In the superradiant regime the experiment gives evidence of a contribution to decoherence which depends on the initial velocity of the condensate. The system is described by the CARL-BEC model, which is a generalization of the Gross-Pitaevskii model to include the self-consistent evolution of the scattered field and a phase-diffusion decoherence process, which accounts for the observed damping.
Collective atomic recoil in a moving Bose-Einstein condensate: From superradiance to Bragg scattering / L. Fallani, C. Fort, N. Piovella, M. Cola, F.S. Cataliotti, R. Bonifacio, M. Inguscio. - In: PHYSICAL REVIEW A. - ISSN 1050-2947. - 71:3(2005), pp. 033612.033612-1-033612.033612-8.
|Titolo:||Collective atomic recoil in a moving Bose-Einstein condensate: From superradiance to Bragg scattering|
BONIFACIO, RODOLFO (Penultimo)
|Settore Scientifico Disciplinare:||Settore FIS/03 - Fisica della Materia|
|Data di pubblicazione:||2005|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1103/PhysRevA.71.033612|
|Appare nelle tipologie:||01 - Articolo su periodico|