Ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein condensates

TL;DR

This paper explores the complex ground-state phase diagram of a mixture of spin-1 and spin-2 Bose-Einstein condensates, revealing diverse phases and symmetry-breaking phenomena at zero magnetic field.

Contribution

It introduces a comprehensive analysis of inter-spin interactions and maps out the phase diagram, highlighting novel tilted spin phases and symmetry-breaking states.

Findings

Rich variety of ground-state phases identified

Existence of tilted spin vector phase breaking axial symmetry

Phase diagrams mapped across parameter space

Abstract

We investigate the ground-state phases of a mixture of spin-1 and spin-2 Bose-Einstein condensates at zero magnetic field. In addition to the intra-spin interactions, two spin-dependent interaction coefficients are introduced to describe the inter-spin interaction. We systematically explore the wide parameter space, and obtain phase diagrams containing a rich variety of phases. For example, there exists a phase in which the spin-1 and spin-2 vectors are tilted relative to each other breaking the axial symmetry.