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Q: Fachverband Quantenoptik und Photonik

Q 26: Quantengase: Fermionen

Q 26.5: Vortrag

Dienstag, 3. März 2009, 17:30–17:45, VMP 6 HS-A

Stability of the three-component ⁶Li⁴⁰K Fermi mixture with a single resonant interaction — •Andreas Trenkwalder¹, Frederik Spiegelhalder¹, Eric Wille¹, Devang Naik¹, Gerhard Hendl¹, Florian Schreck¹, and Rudolf Grimm^1,2 — ¹Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, Innsbruck, Austria — ²Institut für Experimentalphysik und Zentrum für Quantenphysik, Universität Innsbruck, Innsbruck, Austria

We report on the stability of a strongly interacting ⁶Li two-component mixture in presence of weakly interacting ⁴⁰K. The sample consists of ⁶Li in the two lowest spin states and ⁴⁰K in the ground state held in an optical dipole trap. The temperature of ⁴⁰K is close to the Fermi temperature, ⁶Li is degenerate. We measure loss rate coefficients of this mixture for different magnetic fields around the 834 Gauss ⁶Li Feshbach resonance. Despite the mixture consisting of three distinguishable particles, we observe stability against three-body recombination. On the resonance as well as on the BCS side the mixture is very stable. On the molecular side losses increase due to atom-dimer collisions. The stability around the Feshbach resonance will allow to use ⁴⁰K as a probe for the BEC-BCS crossover of ⁶Li.