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Answer by SuperCiocia for Numerics for Bose-Hubbard model
The numerical calculations are usually always carried out in the grand canonical ensemble, so you assume your system of $N$ particles is connected to a large particle reservoir. The chemical potential...
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For the Bose-Hubbard model, we know that there are the Mott insulator phase with $\langle a_i \rangle = 0$ and the superfluid phase with $\langle a_i \rangle \neq 0$. However, when we are trying to...
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