Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 31: Correlated Electrons: Metal Insulator Transition - Part 2

TT 31.12: Vortrag

Donnerstag, 30. März 2006, 17:00–17:15, HSZ 301

Continuous-time quantum Monte Carlo Scheme for Multiorbital Impurity Problems — •Evgeny Gorelov¹, Alexey Rubtsov², and Alexander Lichtenstein¹ — ¹I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg — ²Department of Physics, Moscow State University, 119992 Moscow, Russia

A determinantal continuous-time quantum Monte Carlo (CTQMC) algorithm has been applied for the numerically exact calculation of the fermionic multiorbital impurity path-integral. The five-band model for realistic transition metal atoms with full Coulomb interaction vertex as Kondo impurities in a metal matrix is calculated. The metal-insulator phase transition for two and three anisotropic orbitals on the Bethe lattice with spin-flip interactions is considered. The obtained results are in good agreement with available previous studies. Application to a cobalt impurity in the copper matrix shows the formation of a many-body Abrikosov-Suhl-Kondo resonance near the Fermi level.