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Detecting Entrainment in Fermi-Bose Mixtures

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arxiv 2111.12335 v1 pith:GAIE2Z5A submitted 2021-11-24 cond-mat.quant-gas nucl-th

classification cond-mat.quant-gasnucl-th
keywords entrainmentdetectiongeometryinteractionphaseprotocolringshift
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abstract

We propose an experimental protocol to directly detect the Andreev-Bashkin effect (entrainment) in the bulk mixture of a bosonic and fermionic superfluid using a ring geometry. Our protocol involves the interferometric detection of the entrainment-induced phase gradient across a superfluid due to the flow of another in which it is immersed. The choice of ring geometry eliminates variations in the stronger mean-field interaction which can thwart the detection of entrainment in other geometries. A significant enhancement of the entrainment phase shift signal is possible, if the dimer-boson scattering length turns out to be large, which can be measured by tuning the interaction to the limit of miscibility of the two superfluids. With suggested improvements and careful design implementation, one may achieve $\approx 67$% shift in the interferometer fringes.

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  1. Counterfactual Operator Relevance for PDE Discovery: Screening, Pruning, and Identifiability

    cs.LG 2025-06 reject novelty 2.0 of 10

    Counterfactual term deletion is proposed as a relevance diagnostic for PDE discovery, but the six promised theorems are not in the paper and the main recovery theorem's proof is internally contradictory.

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