Conductance via Multi orbital Kondo Effect in Single Quantum Dot

Details Conductance via Multi orbital Kondo Effect in Single Quantum Dot Conductance via Multi orbital Kondo Effect in Single Quantum Dot

2006-01-25

arxiv.org/abs/cond-mat/0601598v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

6 figures

Scientific paper

10.1103/PhysRevB.73.155332

We study the Kondo effect in a single quantum dot system with two or three orbitals by using the Bethe-ansatz exact solution at zero temperature and the non-crossing approximation at finite temperatures. For the two-orbital Kondo effect, the conductance is shown to be constant at absolute zero in any magnetic fields, but decrease monotonically with increasing fields at finite temperatures. In the case with more orbitals, the conductance increases at absolute zero, while it features a maximum structure as a function of the magnetic field at finite temperatures. We discuss how these characteristic transport properties come from the multi orbital Kondo effect in magnetic fields.

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