Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 4: Correlated Electrons: Quantum Impurities, Kondo Physics
TT 4.7: Vortrag
Montag, 27. März 2006, 12:45–13:00, HSZ 301
Two-stage Kondo effect in a spin-1 quantum dot. — •Babak Bayani1, Piers Coleman2, and Anna Posazhennikova1 — 1Institut für Theoretische Festkörperphysik, Universität Karlsruhe, Wolfgang-Gaede-Str.1, D-76128 Karlsruhe — 2Center for Materials Theory, Rutgers University, Piscataway, NJ 08855, USA
We study the transport through a quntum dot (QD) with spin-1, connected to metallic leads. In practice a spin-1 QD is expected to undergo a two-stage Kondo effect, with a large temperature region, dominated by the underscreened Kondo physics. At zero temperature conductance of such a dot vanish due to interference effects of two channels. We show how this behaviour arises in the detalied many-body calculation, based on the Schwinger boson description of the spin on the dot.