J. Phys. I France
Volume 4, Numéro 11, November 1994
Page(s) 1699 - 1703
DOI: 10.1051/jp1:1994215
J. Phys. I France 4 (1994) 1699-1703

Impurity scattering in 1D ring of interacting electrons

Georges Bouzerar and Didier Poilblanc

Groupe de Physique Théorique, Laboratoire de Physique Quantique, Université Paul Sabatier, 31062 Toulouse, France

(Received 18 May 1994, accepted 28 July 1994)

The stability of the 1D Luttinger liquid phase of interacting spinless particles ( t - V model) to an on-site diagonal disorder is studied by exact diagonalization of small 1D rings up to 22 sites. We discuss our numerical results in the light of the phase diagram predicted by the Renormalization Group analysis. In a finite range of attractive interactions (around $V/t \sim -0.5$) the metallic phase (with superconducting fluctuations) seems to be stable up to some small value of the disorder parameter. On the other hand, in the repulsive case, the impurity potential clearly leads to a strong localization of the particles.

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