Strange behavior of persistent currents in small Hubbard rings
Santanu K. Maiti, J. Chowdhury, S. N. Karmakar
Abstract
We show exactly that small Hubbard rings exhibit unusual kink-like structures giving anomalous oscillations in persistent current. Singular behavior of persistent current disappears in some cases. In half-filled systems mobility gradually drops to zero with interaction, while it converges to some finite value in non-half-filled cases.
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