# Disorderless quasi-localization of polar gases in one-dimensional lattices

## TL;DR

This paper demonstrates that one-dimensional polar gases in optical lattices can exhibit quasi-localization and self-bound droplets due to dipolar interactions, without external disorder, impacting experimental realizations with magnetic atoms and polar molecules.

## Contribution

It reveals disorderless quasi-localization and droplet formation in polar gases caused by dipolar interactions, expanding understanding of constrained dynamics in optical lattices.

## Key findings

- Quasi-localization occurs via dimer clustering at low densities.
- Weak dipoles can form self-bound superfluid droplets.
- Results are applicable to experiments with magnetic atoms and polar molecules.

## Abstract

One-dimensional polar gases in deep optical lattices present a severely constrained dynamics due to the interplay between dipolar interactions, energy conservation, and finite bandwidth. The appearance of dynamically-bound nearest-neighbor dimers enhances the role of the $1/r^3$ dipolar tail, resulting, in the absence of external disorder, in quasi-localization via dimer clustering for very low densities and moderate dipole strengths. Furthermore, even weak dipoles allow for the formation of self-bound superfluid lattice droplets with a finite doping of mobile, but confined, holons. Our results, which can be extrapolated to other power-law interactions, are directly relevant for current and future lattice experiments with magnetic atoms and polar molecules.