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arxiv: cond-mat/0609307 · v2 · submitted 2006-09-13 · ❄️ cond-mat.other · cond-mat.str-el

Hidden order in 1D Bose insulators

Emanuele G. Dalla Torre , Erez Berg , Ehud Altman This is my paper
classification ❄️ cond-mat.other cond-mat.str-el
keywords phasephaseshiddeninsulatingorderspectrumabsorptionanalogous
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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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