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arXiv:0712.0717 · Physical Review A

All-optical production of L7i Bose-Einstein condensation using Feshbach resonances

Noam Gross, Lev Khaykovich

Published Feb 4, 2008• 28 citations
arXivHTMLPDF

Abstract

We show an all-optical method of making $^{7}\text{L}\text{i}$ condensates using the tunability of the scattering length in the proximity of a Feshbach resonance. We report the observation of two Feshbach resonances on the $|F=1,{m}_{F}=0⟩$ state. A narrow (broad) resonance of 7 G (34 G) width is detected at $831\ifmmode\pm\else\textpm\fi{}4\text{ }\text{G}$ $({884}_{\ensuremath{-}13}^{+4}\text{ }\text{G})$. The position of the scattering length zero crossing between the resonances is found at $836\ifmmode\pm\else\textpm\fi{}4\text{ }\text{G}$. The broad resonance is shown to be favorable for runaway evaporation which we perform in a crossed-beam optical-dipole trap. Starting directly from the phase-space density of a magneto-optical trap we observe a Bose-Einstein condensation threshold in less than 3 s of forced evaporation.

DOI
10.1103/physreva.77.023604

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We produce Bose-Einstein condensates of two different species, 87Rb and 41K, in an optical dipole trap in proximity of interspecies Feshbach resonances. We discover and characterize two Feshbach resonances, located around 35 and 79 G, by observing the three-body losses and the elastic cross section. The narrower resonance is exploited to create a double species condensate with tunable interactions. Our system opens the way to the exploration of double species Mott insulators and, more in general, of the quantum phase diagram of the two-species Bose-Hubbard model.
We report on the achievement of Bose-Einstein condensation of erbium atoms and on the observation of magnetic Feshbach resonances at low magnetic fields. By means of evaporative cooling in an optical dipole trap, we produce pure condensates of 168Er, containing up to 7×10(4) atoms. Feshbach spectroscopy reveals an extraordinary rich loss spectrum with six loss resonances already in a narrow magnetic-field range up to 3 G. Finally, we demonstrate the application of a low-field Feshbach resonance to produce a tunable dipolar Bose-Einstein condensate and we observe its characteristic d-wave collapse.