Improved variational approach to the two-site Bose-Hubbard model

Details Improved variational approach to the two-site Bose-Hubbard model Improved variational approach to the two-site Bose-Hubbard model

2011-08-24

arxiv.org/abs/1108.4851v1

Journal of Low Temperature Physics 165, 5, 180 (2011)

Physics

Condensed Matter

Quantum Gases

Accepted for publication in the Journal of Low Temperature Physics

Scientific paper

An improved variational ansatz is proposed to capture the most striking properties of the ground state of a slightly biased attractive two-site Bose-Hubbard Hamiltonian. Our ansatz, albeit its simplicity, is found to capture well the exact properties of the ground state for a wide variety of model parameters, in particular the fragmentation occurring before the formation of cat-like states and also the formation of strongly correlated cat-like states.

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