Coreless vortex dipoles and bubbles in phase-separated binary condensates

TL;DR

This paper investigates the formation of coreless vortex dipoles and bubbles in phase-separated binary condensates when an obstacle moves through them, revealing how interaction parameters and obstacle dynamics influence vortex structures.

Contribution

It demonstrates the creation of coreless vortex dipoles in phase-separated binary condensates using a Gaussian obstacle, highlighting the role of interaction parameters and obstacle dynamics.

Findings

Coreless vortex dipoles are generated above a critical obstacle speed.

The obstacle carries a bubble of the outer component through the inner component.

The system's energy scales influence the vortex dynamics and evolution.

Abstract

Vortex dipoles are generated when an obstacle moves through a superfluid. In case of phase-separated binary condensates, with appropriate interaction parameters in pan-cake shaped traps, we show that coreless vortex dipoles are created when a Gaussian obstacle beam traverses across them above a critical speed. As the obstacle passes through the inner component, it carries along a bubble of the outer component. Using Thomas-Fermi approximation, we show that phase-separated binary condensates can either support vortices with empty or filled cores. For time dependent obstacle potentials, ramped down in the present case, relative energy scales of the system influence the dynamical evolution of the binary condensate.