Spin Josephson vortices in two tunnel coupled spinor Bose gases

TL;DR

This paper investigates the formation, structure, and stability of a novel topological defect called the spin Josephson vortex in spin-1 Bose-Einstein condensates within a double-well potential, highlighting its potential for experimental realization.

Contribution

It introduces the concept of spin Josephson vortices in spinor Bose gases, analyzing their formation, stability, and phase diagram, and proposes a method for their experimental creation.

Findings

Identification of the spin Josephson vortex as a new topological defect.

Analysis of the phase diagram showing conditions for SJV formation.

Proposal of a dynamical method for creating SJVs experimentally.

Abstract

We study topological excitations in spin-1 Bose-Einstein condensates trapped in an elongated double-well optical potential. This system hosts a new topological defect, the spin Josephson vortex (SJV), which forms due to the competition between the inter-well atomic tunneling and short-range ferromagnetic two-body interaction. We identify the spin structure and formation dynamics of the SJV and determine the phase diagram of the system. By exploiting the intrinsic stability of the SJV, we propose a dynamical method to create SJVs under realistic experimental conditions.