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.
|ホスト出版物のタイトル||Realizing Controllable Quantum States: Mesoscopic Superconductivity and Spintronics - In the Light of Quantum Computation|
|出版社||World Scientific Publishing Co.|
|出版ステータス||Published - 2005 1 1|
ASJC Scopus subject areas
- Physics and Astronomy(all)