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Pré-Publication, Document De Travail Année : 2015

Critical Velocity and Dissipation of an ultracold Bose-Fermi Counterflow

Résumé

We study the dynamics of counterflowing bosonic and fermionic lithium atoms. First, by tuning the interaction strength we measure the critical velocity vc of the system in the BEC-BCS crossover in the low temperature regime and we compare it to the recent prediction of Castin et al., Comptes Rendus Physique, 16, 241 (2015). Second, raising the temperature of the mixture slightly above the superfluid transitions reveals an unexpected phase-locking of the oscillations of the clouds. We interpret this observation as resulting from a Zeno-like effect induced by dissipation.
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Dates et versions

hal-01214160 , version 1 (09-10-2015)
hal-01214160 , version 2 (22-10-2015)
hal-01214160 , version 3 (03-11-2015)
hal-01214160 , version 4 (20-11-2015)

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Marion Delehaye, Sébastien Laurent, Igor Ferrier-Barbut, Shuwei Jin, Frédéric Chevy, et al.. Critical Velocity and Dissipation of an ultracold Bose-Fermi Counterflow. 2015. ⟨hal-01214160v4⟩
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