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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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 publicationAIP Conference Proceedings
Pages821-822
Number of pages2
Volume772
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

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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Kondo effect
quantum dots
orbitals
crossovers
exponents
scaling
electrons
temperature
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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

AIP Conference Proceedings. Vol. 772 2005. p. 821-822.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Eto, M 2005, SU(4) Kondo effect in quantum dots with two orbitals and spin 1/2. in AIP Conference Proceedings. vol. 772, pp. 821-822, PHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27, Flagstaff, AZ, United States, 04/7/26. https://doi.org/10.1063/1.1994359
Eto, Mikio. / SU(4) Kondo effect in quantum dots with two orbitals and spin 1/2. AIP Conference Proceedings. Vol. 772 2005. pp. 821-822
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