Fractional domain walls from on-site softening in dipolar bosons
Abstract
We study dipolar bosons in a 1D optical lattice and identify a region in parameter space---strong coupling but relatively weak on-site repulsion---hosting a series of stable charge-density-wave (CDW) states whose low-energy excitations, built from "fractional domain walls," have remarkable similarities to those of non-Abelian fractional quantum Hall states. Here, a conventional domain wall between translated CDW's may be split by inserting strings of degenerate, but inequivalent, CDW states. Outside these insulating regions, we find numerous supersolids as well as a superfluid regime. The mentioned phases should be accessible experimentally and, in particular, the fractional domain walls can be created in the ground state using single-site addressing, i.e., by locally changing the chemical potential.
Keywords
Cite
@article{arxiv.1109.3384,
title = {Fractional domain walls from on-site softening in dipolar bosons},
author = {Emma Wikberg and Jonas Larson and Emil J. Bergholtz and Anders Karlhede},
journal= {arXiv preprint arXiv:1109.3384},
year = {2012}
}
Comments
6 pages, 3 figures. Extended discussion. As published