SU(4) Kondo effect in quantum dots with two orbitals and spin 1/2

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2 Citations (Scopus)

Abstract

We theoretically study the Kondo effect in quantum dots with two orbitals and spin 1/2. The Kondo temperature TK is evaluated, as a function of energy difference Δ between the orbitals, using the scaling method. TK is maximal around the degeneracy point (Δ = 0) and decreases with increasing Δ following a power law, TK(Δ) = T K(0) (TK(0)/Δ)γ, which is understood as a crossover from SU(4) to SU(2) Kondo effect. The exponents on both sides of a level crossing, γL and γR, satisfy a relation of γL γR = 1. We compare this enhanced Kondo effect with that at the spin-singlet-triplet degeneracy for an even number of electrons, to explain recent experimental results.

Original languageEnglish
Title of host publicationPHYSICS OF SEMICONDUCTORS
Subtitle of host publication27th International Conference on the Physics of Semiconductors, ICPS-27
Pages821-822
Number of pages2
DOIs
Publication statusPublished - 2005 Jun 30
EventPHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 - Flagstaff, AZ, United States
Duration: 2004 Jul 262004 Jul 30

Publication series

NameAIP Conference Proceedings
Volume772
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherPHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27
CountryUnited States
CityFlagstaff, AZ
Period04/7/2604/7/30

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Eto, M. (2005). SU(4) Kondo effect in quantum dots with two orbitals and spin 1/2. In PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 (pp. 821-822). (AIP Conference Proceedings; Vol. 772). https://doi.org/10.1063/1.1994359