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http://arxiv.org/abs/1005.2011
and published: Phys. Rev. Lett. 104, 195303 (2010)
Bernd has started his PhD as a QUEST-fellow in our team! Welcome!
We analyze the spinor dynamics of a Rb-87 F=2 condensate initially prepared in the m_F=0 Zeeman sublevel. We show that this dynamics, characterized by the creation of correlated atomic pairs in m_F=+/-1, presents an intriguing multi-resonant magnetic field dependence. This dependence is directly linked to the most unstable Bogoliubov spin excitations of the initial m_F = 0 condensate, showing that, in general, even a qualitative understanding of the pair creation efficiency in a spinor condensate requires a consideration of the confinement. arXiv:0902.2058v1 (2009)
and published: http://link.aps.org/abstract/PRA/v78/e061602
Our Experiment will be part of the lecture "Direkt reingeschaut" in Bielefeld: direkt reingeschaut
We present a detailed analysis of the production efficiency of weakly bound heteronuclear KRb-Feshbach molecules using radio frequency association in a harmonic trap. http://arxiv.org/abs/0809.0340
Manuel Scherer will join our team in April.
We have demonstrated the transport of a degenerate mixture of 87Rb and 40K atoms in a harmonic trap over a distance of 6mm.
We have measured 28 heteronuclear s-wave Feshbach resonances of KRb. The magnetic field positions have been used to determine an exact model of the KRb interaction potentials. http://link.aps.org/abstract/PRA/v76/e020701
We produced a thermal mixture of 2x106 87Rb and 40K atoms in a single beam dipole trap. The atoms were prepared in the F=1, mF=1 (Rb) and the F=9/2 mF=-9/2 quantum states. At 548 G, we obeserved a strong loss feature due to a known Feshbach resonance.
We produced a Bose-Einstein condensate with 87Rb with 300000 atoms at 300 nK. Approximately 20000 40K were sympathetically cooled with the Rubidium atoms. Here is the absorbtion image of the cold Potassium Fermi-Sea:
We investigated the effect of Light Induced Atom Desorption (LIAD) on the loading behaviour of Magneto-Optical-Traps. Our results are published here Publications. The image shows our MOT chamber enlighted with 395nm desorption light from LED arrays:
With RF-evaporation we cooled 100000 87Rb atoms to a Bose-Einstein condensate. The absorbtion image shows the condensate after 10ms time of flight.
We were able to trap fermionic potassium atoms (40K). From fluorescence images of the cloud we estimated 5*106 atoms in the MOT. We used 150 mW cooling and 50mW repumping light (767nm) from a Ti:Sa laser. The first picture of the MOT is shown below.
