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arXiv · 1107.3077

Many-site coherence revivals in the extended Bose-Hubbard model and the Gutzwiller approximation

Uwe R. Fischer·Bo Xiong
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Abstract

We investigate the collapse and revival of first-order coherence in deep optical lattices when long-range interactions are turned on, and find that the first few revival peaks are strongly attenuated already for moderate values of the nearest-neighbor interaction coupling. It is shown that the conventionally employed Gutzwiller wavefunction, with only onsite-number dependence of the variational amplitudes, leads to incorrect predictions for the collapse and revival oscillations. We provide a modified variant of the Gutzwiller ansatz, reproducing the analytically calculated time dependence of first-order coherence in the limit of zero tunneling.

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Uwe R. Fischer, Bo Xiong. 2011-12-28. Many-site coherence revivals in the extended Bose-Hubbard model and the Gutzwiller approximation. https://doi.org/10.1103/physreva.84.063635

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