Stokes drift and impurity transport in a quantum fluid

Stokes drift is a classical fluid effect in which traveling waves transfer momentum to tracers of the fluid, resulting nonzero velocity direction incoming wave; this driving mechanism allowing particles, i.e., impurities, be transported by flow. In (viscous) happens usually due presence viscous drag forces; because eventual absence viscosity quantum fluids, impurities are driven inertial effects and pressure gradients only. We present theoretical predictions analogous fluids finding that, at leading order, amplitude depend on initial impurity position with respect wave phase, second our model recovers but coefficient that depends relative particle-fluid density ratio. Our obtained for using multitime analytical asymptotic expansions. Numerical simulations two-dimensional Gross-Pitaevskii equation coupled corroborate findings. findings experimentally testable, instance, light photorefractive crystals.Received 15 December 2022Revised 19 April 2023Accepted 17 May 2023DOI:https://doi.org/10.1103/PhysRevA.107.L061303Published American Physical Society under terms Creative Commons Attribution 4.0 International license. Further distribution work must maintain attribution author(s) published article's title, journal citation, DOI.Published SocietyPhysics Subject Headings (PhySH)Research AreasFluid-particle interactionsPhysical SystemsQuantum & solidsSuperfluidsUltracold gasesTechniquesPerturbative methodsNonlinear DynamicsFluid DynamicsAtomic, Molecular Optical