Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-12-20
Nature Physics 2, 384 (2006)
Physics
Condensed Matter
Statistical Mechanics
5 pages, 4 figures (v3: new collision data, improved atom number calibration, revised text, improved figures.)
Scientific paper
10.1038/nphys309
Neutral fermions present new opportunities for testing many-body condensed matter systems, realizing precision atom interferometry, producing ultra-cold molecules, and investigating fundamental forces. However, since their first observation, quantum degenerate Fermi gases (DFGs) have continued to be challenging to produce, and have been realized in only a handful of laboratories. In this Letter, we report the production of a DFG using a simple apparatus based on a microfabricated magnetic trap. Similar approaches applied to Bose-Einstein Condensation (BEC) of 87Rb have accelerated evaporative cooling and eliminated the need for multiple vacuum chambers. We demonstrate sympathetic cooling for the first time in a microtrap, and cool 40K to Fermi degeneracy in just six seconds -- faster than has been possible in conventional magnetic traps. To understand our sympathetic cooling trajectory, we measure the temperature dependence of the 40K-87Rb cross-section and observe its Ramsauer-Townsend reduction.
Aubin Sophie
Extavour Marcius H. T.
LeBlanc Lindsay J.
McKay David
Myrskog Stefan
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