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• W1990407712 abstract "A versatile and numerically inexpensive method is presented allowing the accurate calculation of phase diagrams for bosonic lattice models. By treating clusters within the Gutzwiller theory, a surprisingly good description of quantum fluctuations beyond the mean-field theory is achieved approaching quantum Monte-Carlo predictions for large clusters. Applying this powerful method to the Bose-Hubbard model, we demonstrate that it yields precise results for the superfluid to Mott-insulator transition in square, honeycomb, and cubic lattices. Due to the exact treatment within a cluster, the method can be effortlessly adapted to more complicated Hamiltonians in the fast progressing field of optical lattice experiments. This includes state- and site-dependent superlattices, large confined atomic systems and disordered potentials, as well as various types of extended Hubbard models. Furthermore, the approach allows an excellent treatment of systems with arbitrary filling factors. We discuss the perspectives that allow for the computation of large, spatially-varying lattices, low-lying excitations, and time evolution." @default.
• W1990407712 created "2016-06-24" @default.
• W1990407712 creator A5069341569 @default.
• W1990407712 date "2013-04-12" @default.
• W1990407712 modified "2023-09-30" @default.
• W1990407712 title "Cluster Gutzwiller method for bosonic lattice systems" @default.
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• W1990407712 doi "https://doi.org/10.1103/physreva.87.043619" @default.
• W1990407712 hasPublicationYear "2013" @default.
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