Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 45: Correlated Electrons: Poster Session

TT 45.12: Poster

Donnerstag, 29. März 2012, 15:00–19:00, Poster B

Kondo Resonance for Orbitally Degenerate Systems — •Arthur Huber, Aljoscha B. J. Wilhelm, Michael Karolak, Tim O. Wehling, and Alexander I. Lichtenstein — I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg

The Kondo effect is usually connected with the interaction between a localized spin moment and itinerant electrons. However, it is also possible that another internal degree of freedom associated with a degeneracy gives rise to a Kondo effect. One example is the so-called orbital Kondo effect [1], where the pseudospin arising from an orbital degeneracy is screened by the conduction electrons. To acquire a better understanding of this specific Kondo effect, we investigate a general two-band Anderson impurity model within continuous time quantum Monte Carlo simulations [2]. To this end we calculate the static charge susceptibility. Furthermore we investigate, the effects of an external “pseudomagnetic” field in detail.

[1] O.Y. Kolesnychenko et al., Nature (London) 415, 507 (2002).

[2] E. Gull et al., Rev. Mod. Phys. 83, 349404 (2011).