Dirty Hubbard rings: renormalization group and exact diagonalization studies

Details Dirty Hubbard rings: renormalization group and exact diagonalization studies Dirty Hubbard rings: renormalization group and exact diagonalization studies

1995-09-12

arxiv.org/abs/cond-mat/9509060v1

Physics

Condensed Matter

5 pages and 4 eps figures

Scientific paper

We studied mesoscopic Hubbard rings with impurities using the renormalization group (RG) technique and the exact diagonalizations. The exact diagonalization calculations showed that the charge stiffness normalized by the value of clean system has a peak as a function of electron-electron interactions. Previous RG analysis has succeeded to show the enhancement of the stiffness at weak interactions, but does not show the peak behavior. We derived RG equations with $4k_F$ impurity scattering term, which was ignored in the previous studies, and reproduced the overall behavior of the exact diagonalization results.

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