Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2004-06-07
Physics
Condensed Matter
Other Condensed Matter
5 pages, REVTeX4, 4 eps figures, Phys. Rev. A in press
Scientific paper
10.1103/PhysRevA.70.013615
We report the efficient production of a large Bose-Einstein condensate in $^{87}$Rb atoms. This is achieved by quickly reducing the radio-frequency of the magnetic field at a rate of -96.8 kHz/s during the final stage of evaporative cooling, and we have produced a condensate with ${(2.2 \pm 0.1) \times 10^{6}}$ atoms against a serious three-body recombination loss. We observed the dependence of the cooling efficiency on the rate at which the truncated energy changes by measuring the condensate growth for three kinds of radio-frequency sweep. The experimental results quantitatively agree with calculations based on the quantum kinetic theory of a Bose gas.
Mukai Tetsuya
Yamashita Makoto
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