Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2008-03-07
Phys. Rev. Lett. 101, 060406 (2008)
Physics
Condensed Matter
Other Condensed Matter
4 pages, 4 figures. v2: updated comparison with theory; added references; added tick marks to Fig. 1 inset. To be published in
Scientific paper
10.1103/PhysRevLett.101.060406
We measure the effect of a magnetic Feshbach resonance (FR) on the rate and light-induced frequency shift of a photoassociation resonance in ultracold $^7$Li. The photoassociation-induced loss rate coefficient, $K_p$, depends strongly on magnetic field, varying by more than a factor of 10$^4$ for fields near the FR. At sufficiently high laser intensities, $K_p$ for a thermal gas decreases with increasing intensity, while saturation is observed for the first time in a Bose-Einstein condensate. The frequency shift is also strongly field-dependent and exhibits an anomalous blue-shift for fields just below the FR.
Chen Yong P.
Dries Daniel
Hitchcock John
Hulet Randall G.
Junker Markus
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