Turbulent cascade induced persistent current of cold atomic superfluids

TL;DR

This paper proposes a method to generate stable, high-winding-number persistent currents in cold atomic superfluids using a double ring trap and a geometric quench, advancing atomtronic applications and understanding of far-from-equilibrium quantum systems.

Contribution

It introduces a protocol for creating high-winding-number persistent flows in Bose-Einstein condensates via a geometric quench in a double ring trap, enhancing circulation stability.

Findings

High stability and uniformity of circulation flows.

Enhanced circulation flow after geometric quench.

Potential applications in atomtronics and quantum system analysis.

Abstract

Dissipating of disorder quantum vortices in an annular two-dimensional Bose-Einstein condensate can form a macroscopic persistent flow of atoms. We propose a protocol to create persistent flow with high winding number based on a double concentric ring-shaped configuration. We find that a sudden geometric quench of the trap from single ring-shape into double concentric ring-shape will enhance the circulation flow in the outer ring-shaped region of the trap when the initial state of the condensate is with randomly distributed vortices of the same charge. The circulation flows that we created are with high stability and good uniformity free from topological excitations. Our study is promising for new atomtronic designing, and is also helpful for quantitatively understanding quantum tunneling and interacting quantum systems driven far from equilibrium.