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Nature

Observation of Feshbach resonances in a Bose–Einstein condensate

S. Inouye, Michael R. Andrews, J. Stenger, H.‐J. Miesner, Dan Stamper-Kurn, Wolfgang Ketterle

Published Mar 1, 1998• 2,094 citations
Publisher
DOI
10.1038/32354

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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.