Trapping and cooling of rf-dressed atoms in a quadrupole magnetic field

Abstract

We observe the spontaneous evaporation of atoms confined in a bubble-like rf-dressed trap (Zobay and Garraway, 2001). The atoms are confined in a quadrupole magnetic trap and are dressed by a linearly polarized rf field. The evaporation is related to the presence of holes in the trap, at the positions where the rf coupling vanishes, due to its vectorial character. The final temperature results from a competition between residual heating and evaporation efficiency, which is controlled via the height of the holes with respect to the bottom of the trap. The experimental data are modeled by a Monte-Carlo simulation predicting a small increase in phase space density limited by the heating rate. This increase was within the phase space density determination uncertainty of the experiment.

arXiv comment6 pages, 6 figures; to appear in J. Phys. B

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• Supersolid phases of bosonic particles in a bubble trap
• Non-adiabatic losses from radio-frequency dressed cold atom traps: beyond the Landau-Zener model
• RF spectroscopy in a resonant RF-dressed trap
• Novel techniques to cool and rotate Bose-Einstein condensates in time-averaged adiabatic potentials
• A toroidal trap for cold ${}^{87}Rb$ atoms using an rf-dressed quadrupole trap
• RF dressed atoms beyond the linear Zeeman effect
• Runaway evaporation for optically dressed atoms
• Bloch point nanospheres for the design of magnetic traps
• An effective scalar magnetic interaction for resonantly trapped atoms
• A versatile ring trap for quantum gases