J. Phys. IV France
Volume 10, Numéro PR3, March 2000
Organic Superconductivity "20th Anniversary"
Page(s) Pr3-119 - Pr3-124
Organic Superconductivity "20th Anniversary"

J. Phys. IV France 10 (2000) Pr3-119-Pr3-124

DOI: 10.1051/jp4:2000312

Effects of long range electronic interactions on a one-dimensional electron system

S. Capponi1, D. Poilblanc1 and T. Giamarchi2

1  Laboratoire de Physique Quantique & Unité Mixte de Recherche 5626, CNRS, Université Paul Sabatier, 31062 Toulouse, France
2  Laboratoire de Physique des Solides & Unité Mixte de Recherche 2, CNRS, Université Paris-Sud, 91405 Orsay Cedex, France

The effects of a long range electronic potential on a one dimensional chain of spinless fermions are investigated by numerical techniques and analytic calculations. Due to a competition between the 2 kF oscillations in the density and the log divergence of the long wavelength part of the Coulomb potential, the metallic character of the system is enhanced at intermediate (and up to quite large) lengthscales. We found that this quasimetallic regime is not of the Luttinger Liquid type, as evidenced by strong deviations from predictions of conformal field theory and in agreement with the picture of a (very weakly pinned) Wigner crystal. When the strength of the Coulomb interaction is substantially increased, we observe a smooth cross-over to a strongly localized charge density wave.

© EDP Sciences 2000