Persistent Currents in Small, Imperfect Hubbard Rings

Details Persistent Currents in Small, Imperfect Hubbard Rings Persistent Currents in Small, Imperfect Hubbard Rings

2003-10-03

arxiv.org/abs/cond-mat/0310055v1

Phys. Rev. B 68, 195304 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 pages, 4 figures

Scientific paper

10.1103/PhysRevB.68.195304

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.

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