Fast Preparation of a Super-Tonks Gas by Laser Cooling
I will discuss some of our recent results on laser cooling with resonant light to quantum degeneracy: We prepare a one-dimensional degenerate gas of 133Cs atoms with negative scattering length by laser cooling alone. The atoms are confined in an array of elongated optical traps in the vibrational ground state along the two tightly trapped directions by means of degenerate Raman sideband cooling. A quantum degenerate regime is revealed through the emergence of a bimodal time-of flight velocity distribution in the weakly confined direction. Given the large negative scattering length of 133Cs, we infer that the gas forms a highly correlated metastable state, known as super-Tonks gas, where short-distance correlations are highly reduced. This enables fast laser cooling using resonant light in spite of high atomic densities (n~10^15cm^-3), reaching quantum degeneracy within 200 ms.
Host- Luis Orozco