Atomic gases in strongly asymmetric potentials present quasi-one-dimensional structures in the case where both temperature and chemical potential (determined by the energy of pair interaction) are substantially lower than the distance between discrete energy levels of motion in transverse (radial) magnetic field. In the case of identical bosons, such system is integrable in the uniform limit and is described by the Lieb–Liniger model. Quasi-one-dimensional ultracold gas ⁸⁷Ru is experimentally studied in the Atomic institute (Wien, Austria). In this talk a theoretical interpretation of the observed phenomena is presented: thermalization (i.e., a break of the integrability) and loss of the phase coherence. A new method is also presented for measuring temperature of ultracold atomic gases, based on an analysis of pair correlations of atoms in the regime of free escape.

Russian

Page created on June 05, 2009.