Spintronics in quantum dots: Kondo effect in quantum dots with two orbitals and spin 1/2 - Crossover from SU(4) to SU(2) symmetry

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Abstract

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.

Original languageEnglish
Title of host publicationRealizing Controllable Quantum States: Mesoscopic Superconductivity and Spintronics - In the Light of Quantum Computation
PublisherWorld Scientific Publishing Co.
Pages451-456
Number of pages6
ISBN (Print)9789812701619, 9789812564689
DOIs
Publication statusPublished - 2005 Jan 1

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Eto, M. (2005). Spintronics in quantum dots: Kondo effect in quantum dots with two orbitals and spin 1/2 - Crossover from SU(4) to SU(2) symmetry. In Realizing Controllable Quantum States: Mesoscopic Superconductivity and Spintronics - In the Light of Quantum Computation (pp. 451-456). World Scientific Publishing Co.. https://doi.org/10.1142/9789812701619_0070