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- W2558745905 abstract "In any bosonic lattice system, which is not dominated by local interactions and thus frozen in a Mott-type state, numerical methods have to cope with the infinite size of the corresponding Hilbert space even for finite lattice sizes. While it is common practice to restrict the local occupation number basis to $N_c$ lowest occupied states, the presence of a finite condensate fraction requires the complete number basis for an exact representation of the many-body ground state. In this work we present a novel truncation scheme to account for contributions from higher number states. By simply adding a single textit{coherent-tail} state to this common truncation, we demonstrate increased numerical accuracy and the possible increase in numerical efficiency of this method for the Gutzwiller variational wave function and within dynamical mean-field theory." @default.
- W2558745905 created "2016-12-08" @default.
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- W2558745905 date "2017-06-29" @default.
- W2558745905 modified "2023-09-27" @default.
- W2558745905 title "Infinite occupation number basis of bosons: Solving a numerical challenge" @default.
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- W2558745905 doi "https://doi.org/10.1103/physrevb.95.224516" @default.
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