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.

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

References in corpus (8)

• Quantum phase transition from a superfluid to a Mott insulator in a gas of ultracold atoms
• Matter-wave interferometry in a double well on an atom chip
• Radio-frequency dressed state potentials for neutral atoms
• Ultracold atoms confined in rf-induced two-dimensional trapping potentials
• Atom trapping and two-dimensional Bose-Einstein condensates in field-induced adiabatic potentials
• Manipulation of ultracold atoms in dressed adiabatic radio frequency potentials
• Bose-Einstein condensates in RF-dressed adiabatic potentials
• Evaporative cooling in a radio-frequency trap

Cited by in corpus (7)

• A two-dimensional quantum gas in a magnetic trap
• Trapping atoms with radio-frequency adiabatic potentials
• Supersolid phases of bosonic particles in a bubble trap
• RF dressed atoms beyond the linear Zeeman effect
• Runaway evaporation for optically dressed atoms
• Bloch point nanospheres for the design of magnetic traps
• A versatile ring trap for quantum gases