Vortex Lattices in Rotating Atomic Bose Gases with Dipolar Interactions

TL;DR

This paper explores how dipolar interactions influence the groundstates of rotating atomic Bose gases, inducing transitions between various vortex lattice structures and altering quantum fluid phases.

Contribution

It demonstrates the impact of dipolar interactions on vortex lattice symmetries and quantum phases, revealing new groundstate transitions in rotating Bose gases.

Findings

Transition from triangular to square vortex lattices with increasing dipolar interaction

Emergence of stripe and bubble phases at different interaction strengths

Suppression of the Laughlin state in favor of compressible phases

Abstract

We show that dipolar interactions have dramatic effects on the groundstates of rotating atomic Bose gases in the weak interaction limit. With increasing dipolar interaction (relative to the net contact interaction), the mean-field, or high filling fraction, groundstate undergoes a series of transitions between vortex lattices of different symmetries: triangular, square, ``stripe'', and ``bubble'' phases. We also study the effects of dipolar interactions on the quantum fluids at low filling fractions. We show that the incompressible Laughlin state at filling fraction $\nu=1/2$ is replaced by compressible stripe and bubble phases.