Stefania De Palo, Trieste

Mercredi, 7 décembre 2005, 14 h 30,
salle 1, Bâtiment St.Raphael, 3 rue Galilée, 94200 Ivry-sur-Seine
Devices where electrons are confined at the nanoscale in suitable geometries are believed to provide a close realization of the so-called two dimensional electron gas (2DEG) model and are being intensively studied in connection with the apparent metal-insulator transition in two dimensions. Starting from accurate Quantum Monte Carlo (QMC) predictions for 2DEG we have estimated the spin susceptibility for such systems finding that the 2DEG indeed provides a good model once details such as thickness, sources of scattering, and valley degeneracy are kept into account. I will then present the spin susceptibility for a partially polarized 2DEG computed using QMC techniques and compare results with some existing theories.