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

Mikio Eto

doi:10.1142/9789812701619_0070

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

Mikio Eto

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Chapter

Abstract

Kondo effect is theoretically studied in quantum dots with two orbitals and spin 1/2. We evaluate the Kondo temperature T_Kas a function of energy difference Δ between the orbitals using the scaling method. We find that T_Kis maximal around the degeneracy point (Δ = 0) and decreases with increasing |Δ| by a power law. This behavior of T_Kis understood as a crossover from SU(4) to SU(2) Kondo effect. The calculated results agree with recent experimental results.

Original language	English
Title of host publication	Realizing Controllable Quantum States: Mesoscopic Superconductivity and Spintronics - In the Light of Quantum Computation
Publisher	World Scientific Publishing Co.
Pages	451-456
Number of pages	6
ISBN (Print)	9789812701619, 9789812564689
DOIs	https://doi.org/10.1142/9789812701619_0070
Publication status	Published - 2005 Jan 1

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1142/9789812701619_0070

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

Research output: Chapter in Book/Report/Conference proceeding › Chapter

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

Abstract

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