Evaporative cooling of trapped fermionic atoms

Evaporative cooling of sodium atoms.

s (to be published) Abstract No. 1-M3. [9] W. Petrich, M. H. Anderson, J. R. Ensher, and E. A. Cornell, in Fourteenth International Conference on Atomic Physics, Boulder Colorado, 1994 (Ref. [8]). [10] M. Kasevich (private communication). [11] E. Tiesinga, A. J. Moerdijk, B. J. Verhaar, and H. T. C. Stoof, Phys. Rev. A 46, R1167 (1992). [12] H. F. Hess, Phys. Rev. B 34, 3476 (1986). [13] K. B. ...

Evaporative cooling of magnetically trapped atomic molybdenum

Strong evaporative cooling of a trapped cesium gas.

Using forced radio-frequency evaporation, we have cooled cesium atoms prepared in the sublevel F = -m(F) = 3 and confined in a magnetic trap. At the end of the evaporation ramp, the sample contains ~ 7000 atoms at 80 nK, corresponding to a phase space density 3 x 10(-2). A molecular dynamics approach, including the effect of gravity, gives a good account for the experimental data, assuming a sc...

Pure gas of optically trapped molecules created from fermionic atoms.

We report on the production of a pure sample of up to 3 x 10(5) optically trapped molecules from a Fermi gas of 6Li atoms. The dimers are formed by three-body recombination near a Feshbach resonance. For purification, a Stern-Gerlach selection technique is used that efficiently removes all trapped atoms from the atom-molecule mixture. The behavior of the purified molecular sample shows a striki...

‘Baryonic’ bound-state instability in trapped fermionic atoms

Sympathetic cooling of trapped fermionic gases [1] is likely to lead to the creation of degenerate Fermi gases in the near future. In magnetic traps, the fermion’s spin is locked to the field direction. However the advent [2,3] of optical traps holds the promise of degenerate Fermi gases with unquenched spins and hence a variety of nonideal Fermi gases. Already there has been some discussion of...