Abstract
We observe several Feshbach resonances in magnetic fields below 40 G for Cs atoms trapped in a 1D optical lattice. One resonance occurs in the lowest-energy ground state , which is stable against inelastic binary collisions. This opens new possibilities for Bose condensation of Cs. When the elastic collision rate far exceeds the radial vibration frequency, we enter a 2D hydrodynamic regime where the thermalization rate is independent of density and temperature. Other resonances are also observed in the , state through a dramatic increase in the dipolar relaxation rate.
- Received 6 October 1998
DOI:https://doi.org/10.1103/PhysRevLett.82.1406
©1999 American Physical Society