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MA: Fachverband Magnetismus
MA 13: Spinstructures and magnetic Phase Transitions
MA 13.2: Talk
Tuesday, March 27, 2007, 10:30–10:45, H5
Nuclear spin ferromagnetic phase transition in an interacting 2D electron gas — •Pascal Simon1,2 and Daniel Loss1 — 1Department of Physics and Astronomie, University of Basel (Switzerland) — 2LPMMC, university Joseph Fourier & CNRS, Grenoble (France)
Electrons in a two-dimensional semiconducting heterostructure interact with nuclear spins via the hyperfine interaction. Using a a Kondo lattice formulation of the electron-nuclear spin interaction, we show that the nuclear spin system within an interacting two-dimensional electron gas undergoes a ferromagnetic phase transition at finite temperatures. We find that electron-electron interactions and non-Fermi liquid behavior substantially enhance the nuclear spin Curie temperature into the mK range with decreasing electron density.