Phys. Rev. B 77, 064514 (2008) [9 pages]Quantum phase transitions and the hidden order in a two-chain extended boson Hubbard model at half-odd-integer fillingsReceived 18 September 2007; revised 13 December 2007; published 21 February 2008 We study the phase diagram of two weakly coupled one-dimensional dipolar boson chains at half-odd-integer fillings. We find that the system contains a rich phase diagram. Four different phases are found. They are the Mott insulators, the single-particle resonant superfluid, the paired superfluid, and the bond-density or interchain density waves. Moreover, the Mott insulating phase can be further classified according to a hidden string order parameter, which is analogous to the one investigated recently in the one-dimensional boson Mott insulator at integer fillings. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.77.064514
DOI:
10.1103/PhysRevB.77.064514
PACS:
05.30.Jp, 03.75.Kk, 03.75.Lm
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