Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 27: Quantum Gases: Bosons IV
Q 27.2: Talk
Tuesday, March 24, 2015, 14:45–15:00, P/H2
39K and 87Rb dual Bose-Einstein condensates: Production and Experiments — •Lars J. Wacker, Nils Byg Jørgensen, Nils Winter, Jacob F. Sherson, and Jan J. Arlt — Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, 8000 Aarhus C, Denmark
The effective interaction of ultracold atoms can be changed by several orders of magnitude by addressing magnetic Feshbach resonances. Varying the magnetic field hence also determines whether atoms are mutually attractive or repulsive.
This feature in combination with optical trapping allows us to produce 39K BECs. 39K also allows for tuning of its interaction with 87Rb via interspecies resonances. Based on such an interspecies resonance, we have produced the first 39K and 87Rb dual BECs. This novel system opens up for many different research directions. We have been able to use the interspecies resonance to control the miscible/immiscible phase transition of the condensates.
Furthermore this allows studies of the Efimov effect. While originally considered in the context of three identical bosons in nuclear systems, it has more recently been observed in a system of cold atoms. Within our current work we investigate Efimov physics in a two species system, which provides insights beyond the original picture of three identical bosons.