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- W2561572194 abstract "We investigate the ground-state and finite-temperature properties of the Bose-Hubbard model using the standard basis operator method applied to the equation of motion for Green's functions. We show that by introducing the self-consistent approach, the theory goes significantly beyond the mean-field approximation, allowing more-precise description of quantum and thermal fluctuations. For optical lattice systems with ultracold bosons, we find relevant quantitative agreement with numerical and experimental data. In particular, the presented method reveals the importance of thermal fluctuations in time-of-flight experiments. For the most reliable fitting of the visibility analytical curve to the experimental data, the value of temperature is determined and proximity to the quantum regime is discussed. The problem of identification of the superfluid--Mott-insulator phase boundary from time-of-flight experiments is also considered." @default.
- W2561572194 created "2017-01-06" @default.
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- W2561572194 date "2015-07-02" @default.
- W2561572194 modified "2023-09-25" @default.
- W2561572194 title "Ground-state and finite-temperature properties of correlated ultracold bosons on optical lattices" @default.
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- W2561572194 doi "https://doi.org/10.1103/physreva.92.013602" @default.
- W2561572194 hasPublicationYear "2015" @default.
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