High-order perturbation series for Bose-Hubbard rings are reduced to a small set of elementary matrix elements, yielding accurate ground-state energies up to ninth order when compared with exact diagonalization.
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Simplifying higher-order perturbation theory for ring-shaped Bose-Hubbard systems
High-order perturbation series for Bose-Hubbard rings are reduced to a small set of elementary matrix elements, yielding accurate ground-state energies up to ninth order when compared with exact diagonalization.