Quantum protocols in demixed dipolar BEC mixtures in 1D

TL;DR

This paper explores how long-range dipolar effects in 1D ultracold atomic mixtures can be controlled via magnetic fields to create stable, tunable phases and domain-like states, with potential applications in quantum simulation.

Contribution

It introduces a method to tune dipole-dipole interactions in 1D Bose mixtures, enabling the creation of long-lived, domain-like states with adjustable sizes in optical lattices.

Findings

Phase diagrams for different external potentials were determined.

Dipolar interactions can be tuned from repulsive to attractive regimes.

Stable, long-lived domain-like states were proposed and analyzed.

Abstract

Long range dipolar effects in 1D systems either in free or inhomogeneous space are the basis of the state preparation protocol here proposed. Under the presence of an external time-dependent magnetic field, dipole-dipole interactions in the binary ultracold $^{166}$Er -$^{164}$Dy system were tuned from repulsive to attractive to access either, the droplet regime, or the extended one where individual species can be found in mixed or demixed phases. A thorough exploration of weak contact and dipole-dipole effective interactions parameters leads us to determine the phase diagrams of the 1D Bose clouds affected by three different external fields; free homogeneous, harmonic, and optical lattice confining potentials. These results were used to propose long-life states composed of alternate assemblies of individual species confined in optical lattices that mimics magnetic domains, whose size can be adjusted. Our analysis based on numerical experiments within a mean field scheme considered large enough systems as those commonly used in experimental platforms.