Berlin 2008 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)
O 43.2: Poster
Dienstag, 26. Februar 2008, 18:30–19:30, Poster F
Temperature Dependence of the Single Particle Spectral Function of the 2D Kondo Lattice Model using the Dynamical Cluster Approximation — •Lee Martin and Fakher Assaad — Universität Würzburg, Germany
We apply the dynamical cluster approximation, with a quantum Monte Carlo cluster solver using various cluster sizes, to the two-dimensional Kondo lattice model to investigate the evolution of the conduction electron single particle spectral function as a function of temperature. In the hole doped, paramagnetic metallic phase the problem contains two energy scales: the Kondo temperature, TK, and the lower scale, the coherence temperature Tcoh. With decreasing temperature, moving from the local moment to Kondo screened regime, we look for signatures of TK in the spectral function before finally observing the formation of the coherent heavy fermion state at and below Tcoh.