Abstract
We theoretically study an enhancement of the Kondo effect in quantum dots with two orbitals and spin 1 2 . The Kondo temperature and conductance are evaluated as functions of energy difference Δ between the orbitals, using the numerical renormalization group method. The Kondo temperature is maximal around the degeneracy point ( Δ = 0 ) and decreases with increasing | Δ | following a power law, T K ( Δ ) = T K ( 0 ) ( T K ( 0 ) / | Δ | ) γ , which is consistent with the scaling analysis. The conductance at T = 0 is almost constant 2 e 2 / h . Both the orbitals contribute to the conductance around Δ = 0 , whereas the current through the upper orbital is negligibly small when | Δ | ≳ T K ( 0 ) . These are characteristics of SU(4) Kondo effect.
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