Radio-frequency induced ground state degeneracy in a Chromium Bose-Einstein condensate
arXiv:0808.3931 · doi:10.1103/PhysRevA.78.051603
Abstract
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 Landé 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.
4 pages, 4 figures
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- Control of dipolar relaxation in external fields
- RF-field-induced Feshbach resonances
- Tunneling control and localization for Bose-Einstein condensates in a frequency modulated optical lattice
- Magic radio-frequency dressing of nuclear spins in high-accuracy optical clocks
- Microwave spectroscopy of radio-frequency dressed Rb
- Harmonic fine tuning and triaxial spatial anisotropy of dressed atomic spins
- Restoring Narrow Linewidth to a Gradient-Broadened Magnetic Resonance by Inhomogeneous Dressing
- Harmonic dual dressing of spin one-half systems
- Breathing solitons induced by collision in dipolar Bose-Einstein condensates
- Continued fraction analysis of dressed systems: application to periodically driven optical lattices