Hidden order in 1D Bose insulators

Details Hidden order in 1D Bose insulators Hidden order in 1D Bose insulators

2006-09-13

arxiv.org/abs/cond-mat/0609307v2

Phys. Rev. Lett. 97, 260401 (2006)

Physics

Condensed Matter

Other Condensed Matter

Letter

Scientific paper

10.1103/PhysRevLett.97.260401

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.

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