Non-analytic Vortex Core and a Nonlinear Vortex Flow in Bosonic Superfluids

TL;DR

This paper investigates how non-analytic vortex core structures influence nonlinear vortex flow in 2D bosonic superfluids, revealing effects observable at velocities below the critical threshold, with experimental verification proposed.

Contribution

It introduces a new understanding of vortex dynamics by linking non-analytic core reconstructions to nonlinear transport phenomena in superfluids.

Findings

Non-analytic vortex core reconstructions cause strong nonlinear effects.

Vortex motion exhibits significant nonlinearity at velocities below Landau's critical velocity.

Experimental setups are proposed to test these theoretical predictions.

Abstract

We analyze the disorder limited motion of quantum vortices in a two-dimensional bosonic superfluid with a large healing length. It is shown that the excitations of low-energy degrees of freedom associated with the non-analytic reconstruction of the vortex core [Ann. Phys. {\bf 346}, 195 (2014)] determine strong non-linear effects in the vortex transport at velocities much smaller than Landau's critical velocity. Experiments are suggested to verify our predictions.