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Accueil du site > Séminaires > Séminaires 2010 > The effect of a local perturbation in a fermionic ladder

Mardi 14 décembre — 14:00

The effect of a local perturbation in a fermionic ladder

Sam T. Carr (Karlsruhe)

par Pierre Pujol - 14 décembre 2010

In this talk, I will review the effect of a local potential on a single-channel one dimensional quantum wire (the Kane-Fisher problem), and will show how this can be extended to ladder (two-channel) models with counter-intuitive results. For repulsive interaction we find that transport properties of the system are highly sensitive to the transverse gradient of the perturbation : the asymmetric part completely reflects the electrons leading to vanishing conductance at zero temperature, while the flat potential remains transparent.