Hidden order in 1D Bose insulators
Abstract
We investigate the phase diagram of spinless bosons with long range (~ 1/r^3) repulsive interactions, relevant to ultracold polarized atoms or molecules, using DMRG. Between the two conventional insulating phases, the Mott and density wave phases, we find a new phase possessing hidden order revealed by non local string correlations analogous to those characterizing the Haldane gapped phase of integer spin chains. We develop a mean field theory that describes the low energy excitations in all three insulating phases. This is used to calculate the absorption spectrum due to oscillatory lattice modulation. We predict a sharp resonance in the spectrum due to a collective excitation of the new phase that would provide clear evidence for the existence of this phase.
Cite
@article{arxiv.cond-mat/0609307,
title = {Hidden order in 1D Bose insulators},
author = {Emanuele G. Dalla Torre and Erez Berg and Ehud Altman},
journal= {arXiv preprint arXiv:cond-mat/0609307},
year = {2007}
}
Comments
Letter