Regensburg 2004 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 15: Korrelierte Elektronen: Theorie I
TT 15.1: Vortrag
Dienstag, 9. März 2004, 14:30–14:45, H19
The coherence scale of the two-dimensional Kondo Lattice model. — •Fakher F. Assaad — Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland D-97074 Würzburg
A doped hole in the two-dimensional half-filled Kondo lattice model with exchange J and hopping t has momentum (π,π) irrespective of the coupling J/t. The quasiparticle residue of the doped hole, Z ( π, π ) , tracks the Kondo scale, TK, of the corresponding single impurity model. Those results stem from high precision quantum Monte Carlo simulations on lattices up to 12 × 12. Accounting for small dopings away from half-filling within a rigid band approximation, this result implies that the effective mass of the charge carriers at the Fermi level tracks 1/TK or equivalently that the coherence temperature Tcoh ∝ TK. This results is consistent with the large-N saddle point of the SU(N) symmetric Kondo lattice model.