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

研究成果: Conference contribution

2 被引用数 (Scopus)

抄録

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.

本文言語English
ホスト出版物のタイトルPHYSICS OF SEMICONDUCTORS
ホスト出版物のサブタイトル27th International Conference on the Physics of Semiconductors, ICPS-27
ページ821-822
ページ数2
DOI
出版ステータスPublished - 2005 6月 30
イベントPHYSICS OF SEMICONDUCTORS: 27th International Conference on the Physics of Semiconductors, ICPS-27 - Flagstaff, AZ, United States
継続期間: 2004 7月 262004 7月 30

出版物シリーズ

名前AIP Conference Proceedings
772
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

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

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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