# Self-Organized Bosonic Domain Walls

## TL;DR

This paper explores how hardcore bosons on honeycomb lattice ribbons form self-organized domain walls that separate topologically distinct charge-density-wave regions, leading to superfluid transport along the domain walls, with implications for bosonic topological phenomena.

## Contribution

It demonstrates the formation of self-organized bosonic domain walls with topological properties in honeycomb lattice ribbons, a novel phenomenon in bosonic systems.

## Key findings

- Charge domain walls are energetically favorable.
- Superfluid transport occurs along the domain walls.
- The system exhibits topologically distinct charge-density-wave regions.

## Abstract

Hardcore bosons on honeycomb lattice ribbons with zigzag edges are studied using exact numerical simulations. We map out the phase diagrams of ribbons with different widths, which contain superfluid and insulator phases at various fillings. We show that charge domain walls are energetically favorable, in sharp contrast to the more typical occupation of a set of sites on a single sublattice of the bipartite geometry at $\rho=\frac{1}{2}$ filling. This `self-organized domain wall' separates two charge-density-wave (CDW) regions with opposite Berry curvatures. Associated with the change of topological properties, superfluid transport occurs down the domain wall. Our results provide a concrete context to observe bosonic topological phenomena and can be simulated experimentally using bosonic cold atoms trapped in designed optical lattices.