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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Superfluid Acoustics in a Dumbbell Helmholtz Oscillator

Guillaume Gauthier, Stuart S. Szigeti, Matthew T. Reeves, Mark A. Baker, Thomas A. Bell, Halina H. Rubinsztein-Dunlop, Matthew J. Davis, Tyler W. Neely

Published Jan 1, 2020• 0 citations
Publisher

Abstract

We show that an acoustic circuit model quantitatively predicts superfluid transport through a channel. With large initial excitation, we show that typical phase-slip model of the dissipation must be extended to include turbulence. © 2020 The Author(s)
DOI
10.1364/cleopr.2020.c8c_1

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We have experimentally measured transport of superfluid, bosonic atoms in a mesoscopic system: a small channel connecting two large reservoirs. Starting far from equilibrium (superfluid in a single reservoir), we observe first resistive flow transitioning at a critical current into superflow, characterized by oscillations. We reproduce this full evolution with a simple electronic circuit model. We compare our fitted conductance to two different microscopic phenomenological models. We also show that the oscillations are consistent with LC oscillations as estimated by the kinetic inductance and effective capacitance in our system. Our experiment provides an attractive platform to begin to probe the mesoscopic transport properties of a dilute, superfluid, Bose gas.
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