Formation, dynamics and stability of coreless vortex dipoles in phase-separated binary condensates

TL;DR

This paper investigates how a moving obstacle in a phase-separated binary condensate creates vortex dipoles, including coreless ones, revealing new insights into superfluid dynamics and vortex formation.

Contribution

It demonstrates the formation and dynamics of coreless vortex dipoles in phase-separated binary condensates induced by a moving obstacle.

Findings

Vortex dipoles are generated when obstacle velocity exceeds a critical value.

Coreless vortex dipoles can form in the inner component of the condensate.

Outer component transport across the inner component is observed.

Abstract

We study the motion of the Gaussian obstacle potential created by blue detuned laser beam through a phase-separated binary condensate in pancake-shaped traps. For the velocity of the obstacle above a critical velocity, we observe the generation of vortex dipoles in the outer component which can penetrate the inner component. This is equivalent to finite, although small, transport of outer component across the inner component. In the inner component, the same method can lead to the formation of coreless vortex dipoles.