MERCREDI 27 JANVIER 2010
15 heures (Attention horaire inhabituel!)
Salle Séminaire 5
Centre de Physique Théorique
Marseille-Luminy

Séminaire d'Intérêt Général
Thierry Martin
CPT

Titre: Réponse en fréquence d'un condensateur mesoscopique en présence
d'interactions fortes

Résumé: We consider a one dimensional mesoscopic capacitor in the presence of
strong electron interactions and compute its admittance in order to
probe the universal nature of the relaxation resistance. We use a
combination of perturbation theory, renormalization group arguments,
and quantum Monte Carlo calculation to treat the whole parameter range
of dot lead coupling.
The relaxation resistance is universal even in the presence of strong
Coulomb blockade when the interactions in the wire are sufficiently
weak. We predict and observe a quantum phase transition to an
incoherent regime for a Luttinger parameter K<1/2.
Results could be tested using a quantum dot coupled to an edge state
in the fractional quantum Hall effect.