Length-dependent oscillations of the conductance through atomic chains: The importance of electronic correlationsR. A. Molina1, D. Weinmann2 and J.-L. Pichard1, 3
1 CEA/DSM, Service de Physique de l'Etat Condensé, Centre d'Etudes de Saclay 91191 Gif-sur-Yvette, France
2 Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 (CNRS-ULP) 23 rue du Loess, BP 43, 67034 Strasbourg Cedex 2, France
3 Laboratoire de Physique Théorique et Modélisation, Université de Cergy-Pontoise 95031 Cergy-Pontoise Cedex, France
(Received 12 February 2004; accepted in final form 30 April 2004)
We calculate the conductance of atomic chains as a function of their length. Using the Density Matrix Renormalization Group algorithm for a many-body model which takes into account electron-electron interactions and the shape of the contacts between the chain and the leads, we show that length-dependent oscillations of the conductance whose period depends on the electron density in the chain can result from electron-electron scattering alone. The amplitude of these oscillations can increase with the length of the chain, in contrast to the result from approaches which neglect the interactions.
73.23.-b - Electronic transport in mesoscopic systems.
05.60.Gg - Quantum transport.
73.63.Nm - Quantum wires.
© EDP Sciences 2004