Radio-frequency induced ground state degeneracy in a Chromium Bose-Einstein condensate

Details Radio-frequency induced ground state degeneracy in a Chromium Bose-Einstein condensate Radio-frequency induced ground state degeneracy in a Chromium Bose-Einstein condensate

2008-08-28

arxiv.org/abs/0808.3931v2

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.78.051603

We study the effect of strong radio-frequency (rf) fields on a chromium Bose-Einstein condensate (BEC), in a regime where the rf frequency is much larger than the Larmor frequency. We use the modification of the Land\'{e} factor by the rf field to bring all Zeeman states to degeneracy, despite the presence of a static magnetic field of up to 100 mG. This is demonstrated by analyzing the trajectories of the atoms under the influence of dressed magnetic potentials in the strong field regime. We investigate the problem of adiabaticity of the rf dressing process, and relate it to how close the dressed states are to degeneracy. Finally, we measure the lifetime of the rf dressed BECs, and identify a new rf-assisted two-body loss process induced by dipole-dipole interactions.

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