Topological phases of two-component bosons in species-dependent artificial gauge potentials

TL;DR

This paper explores topological phases in two-component bosonic systems under species-dependent artificial gauge fields, proposing new states via composite fermion and parton theories, supported by exact diagonalization and trial wave functions.

Contribution

It introduces novel topological phases for two-component bosons with species-dependent gauge potentials, combining theoretical constructions with numerical validation.

Findings

Some proposed states are realized with contact interactions

Ground states are modeled with trial wave functions

Effective field theories reveal unique properties

Abstract

We study bosonic atoms with two internal states in artificial gauge potentials whose strengths are different for the two components. A series of topological phases for such systems is proposed using the composite fermion theory and the parton construction. It is found in exact diagonalization that some of the proposed states may be realized for simple contact interaction between bosons. The ground states and low-energy excitations of these states are modeled using trial wave functions. The effective field theories for these states are also constructed and reveal some interesting properties.