Formation of a condensed state with macroscopic number of phonons in ultracold Bose gases

Details Formation of a condensed state with macroscopic number of phonons in ultracold Bose gases Formation of a condensed state with macroscopic number of phonons in ultracold Bose gases

2007-05-29

arxiv.org/abs/0705.4164v1

Physics

Condensed Matter

Other Condensed Matter

9 pages, 8 figures

Scientific paper

10.1103/PhysRevA.76.023601

A mechanism for the formation of a new type of stationary state with macroscopical number of phonons in condensed atomic gases is proposed. This mechanism is based on generating longitudinal phonons as a result of parametric resonance caused by a permanent modulation of the transverse trap frequency in an elongated trap. The phonon-phonon interaction predetermines the self-consistent evolution which is completed with macroscopic population of one from all levels within the energy interval of parametric amplification. This level proves to be shifted to the edge of this interval. All other levels end the evolution with zero population.

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