22,873 research outputs found
Effective size of a trapped atomic Bose gas
We investigate the temperature-dependent effective size of a trapped
interacting atomic Bose gas within a mean field theory approximation. The
sudden shrinking of the average length, as observed in an earlier experiment by
Wang {\it et al.} [Chin. Phys. Lett. {\bf 20}, 799 (2003)], is shown to be a
good indication for Bose-Einstein condensation (BEC). Our study also supports
the use of the average width of a trapped Bose gas for a nondestructive
calibration of its temperature.Comment: RevTex4, 6 pages, 4 eps figures, to appear in Phys. Rev.
An effective quasi-one-dimensional description of a spin-1 atomic condensate
Within the mean field theory we extend the effective quasi-1D non-polynomial
Schr\"{o}dinger equation (NPSE) approach to the description of a spin-1 atomic
condensate in a tight radial confinement geometry for both weak and strong
atom-atom interactions. Detailed comparisons with full time dependent 3D
numerical simulations show excellent agreement as in the case of a single
component scalar condensate, demonstrating our result as an efficient and
effective tool for the understanding of spin-1 condensate dynamics observed in
several recent experiments.Comment: 5 pages, 3 eps figures, to appear in Phys. Rev. A. Small typoes
corrections. Updated Reference
Bose-stimulated scattering off a cold atom trap
The angle and temperature dependence of the photon scattering rate for
Bose-stimulated atom recoil transitions between occupied states is compared to
diffraction and incoherent Rayleigh scattering near the Bose-Einstein
transition for an optically thin trap in the limit of large particle number, N.
Each of these processes has a range of angles and temperatures for which it
dominates over the others by a divergent factor as N->oo.Comment: 18 pages (REVTeX), no figure
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