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Collapse and revival dynamics of superfluids of ultracold atoms in optical lattices | | E. Tiesinga
; P. R. Johnson
; | | Date: |
7 Apr 2011 | | Abstract: | Recent experiments have shown a remarkable number of collapse-and-revival
oscillations of the matter-wave coherence of ultracold atoms in optical
lattices [Will et al., Nature 465, 197 (2010)]. Using a mean-field
approximation to the Bose-Hubbard model, we show that the visibility of
collapse-and-revival interference patterns reveal number squeezing of the
initial superfluid state. To describe the dynamics, we use an effective
Hamiltonian that incorporates the intrinsic two-body and induced three-body
interactions, and we analyze in detail the resulting complex pattern of
collapse-and-revival frequencies generated by virtual transitions to higher
bands. Our work shows that a combined analysis of both the multiband,
non-stationary dynamics in the final deep lattice, and the number-squeezing of
the initial superfluid state, explains important characteristics of optical
lattice collapse-and-revival physics. | | Source: | arXiv, 1104.1402 | | Services: | Forum | Review | PDF | Favorites | |
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