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Hecker Denschlag

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Articles

Second sound in the crossover from the Bose-Einstein condensate to the Bardeen-Cooper-Schrieffer superfluid - Nature Communications

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By Vijay Pal, Hecker Denschlag, Institut für Quantenmaterie, Universität Ulm
| Nature Verified
Abstract Second sound is an entropy wave which propagates in the superfluid component of a quantum liquid. Because it is an entropy wave, it probes the thermodynamic properties of the quantum liquid. Here, we study second sound propagation for a large range of interaction strengths within the crossover between a Bose-Einstein condensate (BEC) and the Bardeen-Cooper-Schrieffer (BCS) superfluid, extending previous work at unitarity.
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Inelastic collisions of ultracold triplet Rb2 molecules in the rovibrational ground state

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By Hecker Denschlag, Björn Drews, Institut für Quantenmaterie, Markus Deiß
| Nature Verified
In the following, we first discuss the collision experiments with Rb Feshbach molecules as this will help us analysing the data for the v=0 states. Figure 2a shows three data sets of N(t) corresponding to different confinements of the potential tubes. We observe a strong loss of molecules within the first tens of milliseconds.
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