Vortex phase diagram in rotating two-component Bose-Einstein condensates

TL;DR

This paper explores the diverse vortex structures in rotating two-component Bose-Einstein condensates, revealing phase transitions in vortex lattice arrangements as intercomponent coupling varies.

Contribution

It provides a detailed phase diagram showing how vortex lattice structures evolve with intercomponent coupling and rotation frequency.

Findings

Vortex lattices transition from triangular to square configurations.

Formation of double-core and serpentine vortex sheet structures.

Rich equilibrium vortex phases depending on coupling and rotation.

Abstract

We investigate the structure of vortex states in rotating two-component Bose-Einstein condensates with equal intracomponent but varying intercomponent coupling constants. A phase diagram in the intercomponent-coupling versus rotation-frequency plane reveals rich equilibrium structures of vortex states. As the ratio of intercomponent to intracomponent couplings increases, the interlocked vortex lattices undergo phase transitions from triangular to square, to double-core lattices, and eventually develop interwoven "serpentine" vortex sheets with each component made up of chains of singly quantized vortices.