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Artificial gauge fields are versatile tools that allow to influence thedynamics of ultracold atoms in Bose-Einstein condensates. Here we discuss amethod of artificial gauge field generation stemming from the evanescent fieldsof the curved surface of an optical nanofibre. The exponential decay of theevanescent fields leads to large gradients in the generalized Rabi frequencyand therefore to the presence of geometric vector and scalar potentials. Bysolving the Gross-Pitaevskii equation in the presence of the artificial gaugefields originating from the fundamental HE$_{11}$ mode of the fibre, we showthat vortex rings can be created in a controlled manner. We also calculate themagnetic fields resulting from the higher order HE$_{21}$, TE$_{01}$, andTM$_{01}$ modes and compare them to the fundamental HE$_{11}$ mode.

Creating superfluid vortex rings in artificial magnetic fields