Improved variational approach to the two-site Bose-Hubbard model
classification
❄️ cond-mat.quant-gas
keywords
ansatzbose-hubbardcapturecat-likeformationgroundimprovedmodel
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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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