Berlin 2008 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 29: Symposium: Surface Spectroscopy on Kondo Systems I (Invited Speakers: Wolf-Dieter Schneider, Fakher Assaad, Serguei Molodtsov)

O 29.2: Hauptvortrag (ohne Erstattung)

Dienstag, 26. Februar 2008, 11:45–12:15, HE 101

The Kondo Lattice in two dimensions: numerical studies of the Fermi surface. — •Fakher F. Assaad, Kevin S.D. Beach, and Lee C. Martin — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany

The Kondo lattice model on a square lattice is the simplest model capturing the physics of heavy fermion materials. Below the coherence temperature and in the paramagnetic phase, it describes the heavy fermion metallic state which is characterized by a large Fermi surface with Luttinger volume incorporating both the conduction electrons and the localized moments. In this talk we will review recent results aimed at understanding the evolution and breakdown of this Fermi surface as function of temperature, magnetic field as well as across a magnetic order-disorder transition. Our results stem from large scale Quantum Monte Carlo simulations in the framework of the Dynamical Cluster Approximation.