Mardi 12 juin 2012 à 11h15
Salle 234, Ecole de Physique

Impurity scattering in 1D electron-phonon liquid

Alexey Galda, University of Birmingham, United Kingdom

We study the influence of electron-phonon coupling on electron transport through a Luttinger liquid with an embedded weak scatterer or weak link. We derive the renormalization group (RG) equations, which indicate that the directions of RG flows can change upon varying either the relative strength of the electron-electron and electron-phonon coupling or the ratio of Fermi to sound velocities. This results in a rich phase diagram with up to three fixed points: two stable ones, corresponding to an ideal metal or insulator, and an intermediate unstable one.