SIGNIFICANT EVENTS  SCIENCE EVENTS
06/15/01
Paper Presented at the PanPacific Conference Describes Mixtures of BEC
PI SuiTat Chui of the University of Deleware describes a paper he presented at the
2nd PanPacific Workshop on Research in Microgravity discussing the behavior of
mixtures of BoseEinstein condensates. The article defines regions of metastability
of the quantum spinoidal phase and exact solutions of the twocomponent GrossPitaevskii
equation. When a mixture of two BoseEinstein condensates phase separates, it exhibits
a periodic density modulation for a very long time. The paper reports
that there are
exact solutions of the nonlinear equations that govern the physics of the system that
exhibit the periodic density modulation. These solutions demonstrate the metastability
of the system, and they show that the nonlinearities do not destroy the periodic state.
Furthermore, these exact solutions are found only for certain concentrations of the
mixtures. This dependence on concentrations suggests that the metastability exists
only in certain regions of the phase diagram for the mixtures. This paper has been
accepted for publication in Physical Review Letters.
