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This content will become publicly available on August 12, 2016

Title: Competing exotic quantum phases of spin- 12 ultracold lattice bosons with extended spin interactions

Advances in pure optical trapping techniques now allow the creation of degenerate Bose gases with internal degrees of freedom. Systems such as 87Rb, 39K or 23Na in the F = 1 hyperfine state offer an ideal platform for studying the interplay of super fluidity and quantum magnetism. Motivated by the experimental developments, we study ground state phases of a two-component Bose gas loaded on an optical lattice. We describe this effectively by the Bose-Hubbard Hamiltonian with onsite and near neighbor spin-spin interactions. One important feature of our investigation is the inclusion of interconversion (spin-flip) terms between the two species, which has been observed in optical lattice experiments. Furthermore, using mean-field theory and quantum Monte Carlo simulations, we map out the phase diagram of the system. A rich variety of phases is identified, including antiferromagnetic (AF) Mott insulators, ferromagnetic and AF super fluids.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Univ. of California, Davis, CA (United States). Dept. of Physics
  2. Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics
  3. Univ. of Nice (France). Non-Linear Institute of Nice (INLN); Inst. Univ. of France, Paris (France); CNRS-UNS-NUS-NTU National Univ. of Singapore (Singapore)
Publication Date:
OSTI Identifier:
1344114
Grant/Contract Number:
NA0001842
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 5; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
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