Heteronuclear magnetisms with ultracold spinor bosonic gases in optical lattices

TL;DR

This paper explores the rich magnetic phases possible in heteronuclear spinor bosonic gases in optical lattices, revealing new phases due to all angular momentum states being allowed and analyzing their properties using dynamical mean-field theory.

Contribution

It introduces a comprehensive analysis of heteronuclear magnetism in spinor bosonic gases, highlighting new magnetic phases arising from all angular momentum states and their coexistence.

Findings

Multiple magnetic phases characterized by various orders are identified.

Degeneracy and many-body interactions influence the symmetry-breaking phases.

Parameter regimes for observing these phases are proposed.

Abstract

Motivated by recent realizations of spin-1 NaRb mixtures in the experiments, here we investigate heteronuclear magnetism in the Mott-insulating regime. Different from the identical mixtures where the boson (fermion) statistics only admits even (odd) parity states from angular momentum composition, for heteronuclear atoms in principle all angular momentum states are allowed, which can give rise to new magnetic phases. Various magnetic phases can be developed over these degenerate spaces, however, the concrete symmetry breaking phases depend not only on the degree of degeneracy, but also the competitions from many-body interactions. We unveil these rich phases using the bosonic dynamical mean-field theory approach. These phases are characterized by various orders, including spontaneous magnetization order, spin magnitude order, singlet pairing order and nematic order, which may coexist, especially in the regime with odd parity. Finally we address the possible parameter regimes for observing these spin-ordered Mott phases.