Route to supersolidity for the extended Bose-Hubbard model

We use the Gutzwiller ansatz and analyze the phase diagram of the extended Bose-Hubbard Hamiltonian with on-site (U) and nearest-neighbor (V) repulsions. For d-dimensional hypercubic lattices, when 2dVU, in this Rapid Communication, we show that the ground state has only CDW insulators, and more imp...

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Bibliographic Details
Published in:Physical review. A, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-05, Vol.83 (5), Article 051606
Main Author: Iskin, M.
Format: Article
Language:English
Subjects:
ATOMIC AND MOLECULAR PHYSICS
BOSE-EINSTEIN GAS
CHARGE DENSITY
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL MODELS
DIAGRAMS
HAMILTONIANS
HUBBARD MODEL
INFORMATION
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
PHASE DIAGRAMS
QUANTUM OPERATORS
SUPERFLUIDITY
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Summary:We use the Gutzwiller ansatz and analyze the phase diagram of the extended Bose-Hubbard Hamiltonian with on-site (U) and nearest-neighbor (V) repulsions. For d-dimensional hypercubic lattices, when 2dVU, in this Rapid Communication, we show that the ground state has only CDW insulators, and more importantly, the SS phase occupies a much larger region in the phase diagram, existing up to very large hopping values which could be orders of magnitude higher than that of the well-known case. In particular, the SS-superfluid phase boundary increases linearly as a function of hopping when 2dV > or approx. 1.5U, for which the prospects of observing the SS phase with dipolar Bose gases loaded into optical lattices is much higher.
ISSN:1050-2947
1094-1622
DOI:10.1103/PhysRevA.83.051606