Kondo effect is theoretically studied in quantum dots with two orbitals and spin 1/2. We evaluate the Kondo temperature TKas a function of energy difference Δ between the orbitals using the scaling method. We find that TKis maximal around the degeneracy point (Δ = 0) and decreases with increasing |Δ| by a power law. This behavior of TKis understood as a crossover from SU(4) to SU(2) Kondo effect. The calculated results agree with recent experimental results.
|Realizing Controllable Quantum States: Mesoscopic Superconductivity and Spintronics - In the Light of Quantum Computation
|World Scientific Publishing Co.
|Published - 2005 1月 1
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