Generation of vortex dipoles in superfluid Fermi gas in BCS limit

TL;DR

This paper theoretically explores how vortex dipoles are generated in superfluid Fermi gases in the BCS limit, highlighting mechanisms like obstacle movement and shock wave decay, with a focus on pancake-shaped traps.

Contribution

It introduces a theoretical framework for vortex dipole generation in superfluid Fermi gases, emphasizing the role of shock waves and trap geometry.

Findings

Shock waves can decay into vortex dipoles in pancake-shaped traps.

Density ripples form from shock waves before vortex dipole creation.

Vortex dipoles are generated either by obstacle movement or shock wave decay.

Abstract

We theoretically investigate the generation of the vortex dipoles in superfluid Fermi gas in the BCS limit. The vortex dipoles are generated in superfluid either by moving an obstacle above a critical speed or due to the decay of the shock waves obtained on the sudden mixing of two superfluid fragments. We observe that in pancake-shaped traps, the shock waves can lead to the formation of density ripples, which decay into vortex dipoles due to the onset of snake instability.