On-site repulsion monotonically suppresses current in ordered rings while extended interactions show filling-dependent enhancement or suppression, with disorder altering these trends at low fillings.
Thus, without loss of generality, we set the on-site potential at each site to zero (ǫi = 0)
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Exact and mean-field analysis of the role of Hubbard interactions on flux driven circular current in a quantum ring
On-site repulsion monotonically suppresses current in ordered rings while extended interactions show filling-dependent enhancement or suppression, with disorder altering these trends at low fillings.