Dirty Hubbard rings: renormalization group and exact diagonalization studies
Hiroyuki Mori, Minoru Hamada
Abstract
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 4kF impurity scattering term, which was ignored in the previous studies, and reproduced the overall behavior of the exact diagonalization results.
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