Fractional domain walls from on-site softening in dipolar bosons

Details Fractional domain walls from on-site softening in dipolar bosons Fractional domain walls from on-site softening in dipolar bosons

2011-09-15

arxiv.org/abs/1109.3384v3

Phys. Rev. A 85, 033607 (2012)

Physics

Condensed Matter

Quantum Gases

6 pages, 3 figures. Extended discussion. As published

Scientific paper

10.1103/PhysRevA.85.033607

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.

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