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Collective Feshbach scattering of a superfluid droplet from a mesoscopic two-component Bose-Einstein condensate

M. Grupp·G. Nandi·R. Walser·W. P. Schleich
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Abstract

We examine the collective scattering of a superfluid droplet impinging on a mesoscopic Bose-Einstein condensate (BEC) as a target. The BEC consists of an atomic gas with two internal electronic states, each of which is trapped by a finite-depth external potential. An off-resonant optical laser field provides a localized coupling between the BEC components in the trapping region. This mesoscopic scenario matches the microscopic setup for Feshbach scattering of two particles, when a bound state of one sub-manifold is embedded in the scattering continuum of the other sub-manifold. Within the mean-field picture, we obtain resonant scattering phase shifts from a linear response theory in agreement with an exact numerical solution of the real time scattering process and simple analytical approximations thereof. We find an energy-dependent transmission coefficient that is controllable via the optical field between 0 and 100%.

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M. Grupp, G. Nandi, R. Walser, W. P. Schleich. 2005-10-27. Collective Feshbach scattering of a superfluid droplet from a mesoscopic two-component Bose-Einstein condensate. https://doi.org/10.1103/physreva.73.050701

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