Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 46: Quantengase (Wechselwirkungseffekte)

Q 46.5: Talk

Wednesday, March 21, 2007, 17:30–17:45, 6J

Investigation of a chromium BEC in the vicinity of a Feshbach resonance — •Thierry Lahaye, Tobias Koch, Marco Fattori, Bernd Fröhlich, Axel Griesmaier, and Tilman Pfau — 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany

Due to its large magnetic moment (6 Bohr magnetons), tuning the scattering length of chromium atoms by using a magnetic Feshbach resonance is a promising way to the realization of a purely dipolar quantum gas. We have modified our BEC apparatus, with which we have already measured dipolar effects on the expansion dynamics of a BEC [Phys. Rev. A 74, 013621 (2006)], to investigate the BEC near a resonance at 590 G. This resonance has an expected width of 1.7 G. Using fast switching magnetic fields and a high field imaging system we are now able to condense above this resonance and investigate the BEC in its vicinity. We report on the recent experimental progress.