  Transport properties of the two-orbital Kondo effect involving both spin and
orbital (pseudospin) degrees of freedom were examined in a parallel double
quantum dot with a sufficient interdot Coulomb interaction and negligibly small
interdot tunneling. The Kondo effect was observed at the interdot Coulomb
blockade region with degeneracies of both spin and orbital degrees of freedom.
When the orbital degeneracy is lifted by applying a finite detuning, the Kondo
resonance exhibits a triple-peak structure, indicating that both spin and
orbital contributions are involved.
