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Critical Velocity and Dissipation of an ultracold Bose-Fermi Counterflow
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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.
Forward citations
Cited by 2 Pith papers
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Dissipation triggers dynamical two-stream instability
Dissipation makes the relativistic two-stream instability dynamical exactly at the counterflow velocity where an ideal fluid would only show an energetic instability.
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Environment-induced synchronization of two quantum oscillators
Two detuned quantum harmonic oscillators coupled to a common zero-temperature bosonic bath exhibit environment-induced frequency locking and, at stronger coupling, a regime of long-lived synchronized oscillations.
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