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Repulsion-sustained supercurrent and flux quantization in rings of symmetric Hubbard clusters
We test the response to a threading magnetic field of rings of five-site ${C}_{4v}$-symmetric repulsive Hubbard clusters connected by weak intercell links; each five-site unit has the topology of a ${\mathrm{CuO}}_{4}$ cluster and a repulsive interaction is included on every site. In a numerical study of the three-unit ring with …