Tay, Tiamhock and Motrunich, Olexei I. (2011) Possible realization of the exciton Bose liquid phase in a hard-core boson model with ring-only exchange interactions. Physical Review B, 83 (20). Art. No. 205107. ISSN 0163-1829 http://resolver.caltech.edu/CaltechAUTHORS:20110603-094323218
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We investigate a hard-core boson model with ring-only exchanges on a square lattice, where a K_1 term acts on 1×1 plaquettes and a K_2 term acts on 1×2 and 2×1 plaquettes, with a goal of realizing a novel exciton Bose liquid (EBL) phase first proposed by Paramekanti et al. [Phys. Rev. B 66, 054526 (2002)]. We construct Jastrow-type variational wave functions for the EBL, study their formal properties, and then use them as seeds for a projective quantum Monte Carlo study. Using the Green’s function Monte Carlo approach, we obtain an unbiased phase diagram that at half-filling reveals a charge density wave for small K_2, a valence bond solid for intermediate K_2, and possibly for large K_2 the EBL phase. Away from half-filling, the EBL phase is present for intermediate K_2 and remains stable for a range of densities below 1/2 before phase separation occurs at lower densities.
|Additional Information:||© 2011 American Physical Society. Received 5 November 2010; revised 18 March 2011; published 17 May 2011. We are thankful to M. P. A. Fisher for inspiring discussions and encouragement throughout this work and R. Kaul and A. Paramekanti for discussions. The research is supported by the NSF through Grant No. DMR-0907145 and the A. P. Sloan Foundation. We also acknowledge using the IT2 cluster at the Caltech CACR as well as the hospitality of the Max Planck Institute for the Physics of Complex Systems.|
|Classification Code:||PACS: 75.10.Jm, 05.30.Jp, 71.10.Pm, 75.10.Kt|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||14 Jun 2011 18:11|
|Last Modified:||26 Dec 2012 13:17|
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