Three-orbital Kondo effect in single quantum dot system with plural electrons

Details Three-orbital Kondo effect in single quantum dot system with plural electrons Three-orbital Kondo effect in single quantum dot system with plural electrons

2008-07-11

arxiv.org/abs/0807.1780v1

J. Phys. Soc. Jpn. 77 (2008) 094707

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 10 figures, accepted for publication in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.77.094707

We study the Kondo effect and related transport properties in orbitally degenerate vertical quantum dot systems with plural electrons. Applying the non-crossing approximation to the three-orbital Anderson impurity model with the finite Coulomb interaction and Hund-coupling, we investigate the magnetic-field dependence of the conductance and thermopower. We also introduce an additional orbital splitting to take account of the realistic many-body effect in the vertical quantum dot system. It is clarified how the three-orbital Kondo effect influences the transport properties via the modulation of the Kondo temperature and unitary limit of transport quantities due to the change of the symmetry in the system.

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