Persistent Currents in Small, Imperfect Hubbard Rings

Abstract

We have done a study with small, imperfect Hubbard rings with exact diagonalization. The results for few-electron rings show, that the imperfection, whether localized or not, nearly always decrease, but can also \emph{increase} the persistent current, depending on the character of the imperfection and the on-site interaction. The calculations are generally in agreement with more specialized studies. In most cases the electron spin plays an important role.

6 pages, 4 figures

References in corpus (2)

• Energy spectra of quantum rings
• Aharonov-Bohm oscillations of a tunable quantum ring

Cited by in corpus (7)

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• Imperfect nanorings with superconducting correlations
• Electromagnetic manipulation for anti-Zeno effect in an engineered quantum tunneling process
• Fractional periodicity of persistent current in coupled quantum rings
• Large diamagnetic persistent currents
• Persistent spin current in anisotropic spin ring
• Exact and mean-field analysis of the role of Hubbard interactions on flux driven circular current in a quantum ring