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

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

2011-07-15

arxiv.org/abs/1107.3077v2

Phys. Rev. A 84, 063635 (2011)

Physics

Condensed Matter

Quantum Gases

8+\epsilon{} pages of RevTex4-1, 4 figures; with an appendix added, has been published in Physical Review A

Scientific paper

10.1103/PhysRevA.84.063635

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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