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Title: Phase stability in the two-dimensional anisotropic boson Hubbard Hamiltonian

The two dimensional square lattice hard-core boson Hubbard model with near neighbor interactions has a ‘checkerboard’ charge density wave insulating phase at half-filling and sufficiently large intersite repulsion. When doped, rather than forming a supersolid phase in which long range charge density wave correlations coexist with a condensation of superfluid defects, the system instead phase separates. However, it is known that there are other lattice geometries and interaction patterns for which such coexistence takes place. In this paper we explore the possibility that anisotropic hopping or anisotropic near neighbor repulsion might similarly stabilize the square lattice supersolid. Lastly, by considering the charge density wave structure factor and superfluid density for different ratios of interaction strength and hybridization in the ˆx and ˆy directions, we conclude that phase separation still occurs.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [5]
  1. Harbin Institute of Technology, Harbin (China); Univ. of California, Davis, CA (United States)
  2. Univ. de Nice-Sophia Antipolis, Valbonne (France); Institut Univ. de France (France); National Univ. of Singapore (Singapore)
  3. Louisiana State Univ., Baton Rouge, LA (United States)
  4. Harbin Institute of Technology, Harbin (China)
  5. Univ. of California, Davis, CA (United States)
Publication Date:
OSTI Identifier:
1343974
Grant/Contract Number:
NA0001842; FC02-06ER25792
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 19; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
The Regents of the Univ. of California, Davis, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY