2 research outputs found
Loading of a Bose-Einstein condensate in the boson-accumulation regime
We study the optical loading of a trapped Bose-Einstein condensate by
spontaneous emission of atoms in excited electronic state in the
Boson-Accumulation Regime. We generalize the previous simplified analysis of
ref. [Phys. Rev. A 53, 2466 (1996)], to a 3D case in which more than one trap
level of the excited state trap is considered. By solving the corresponding
quantum many-body master equation, we demonstrate that also for this general
situation the photon reabsorption can help to increase the condensate fraction.
Such effect could be employed to realize a continuous atom laser, and to
overcome condensate losses.Comment: 7 pages, 5 eps figures, uses epl.st
Continuous optical loading of a Bose-Einstein Condensate in the Thomas-Fermi regime
We discuss the optical loading of a Bose-Einstein condensate in the
Thomas-Fermi regime. The condensate is loaded via spontaneous emission from a
reservoir of excited-state atoms. By means of a master equation formalism, we
discuss the modification of the condensate temperature during the loading. We
identify the threshold temperature, , above (below) which the loading
process leads to cooling (heating), respectively. The consequences of our
analysis for the continuous loading of an atom laser are discussed.Comment: 7 pages, 3 figure