Enhanced Kondo effect via tuned orbital degeneracy in a spin 1/2 artificial atom

S. Sasaki, S. Amaha, N. Asakawa, Mikio Eto, S. Tarucha

Research output: Contribution to journalArticle

103 Citations (Scopus)

Abstract

A strong Kondo effect in vertical quantum dot holding an odd number of electrons and spin 1/2 was investigated. The estimated Kondo temperature for 'doublet-doublet' degeneracy was found to be similar to that for singlet-triplet degeneracy with an even electron number, indicating that a total of fourfold spin and orbital degeneracy accounts for enhancement of the Kondo temperature. An orbital degeneracy for odd N and S = 1/2 dramatically enhanced the Kondo effect. The results show that an SU(4) model at orbital degeneracy is used to qualitatively reproduce experimental observation.

Original languageEnglish
Pages (from-to)17205-17201
Number of pages5
JournalPhysical Review Letters
Volume93
Issue number1
DOIs
Publication statusPublished - 2004 Jul 2

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Kondo effect
orbitals
atoms
electrons
quantum dots
temperature
augmentation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Enhanced Kondo effect via tuned orbital degeneracy in a spin 1/2 artificial atom. / Sasaki, S.; Amaha, S.; Asakawa, N.; Eto, Mikio; Tarucha, S.

In: Physical Review Letters, Vol. 93, No. 1, 02.07.2004, p. 17205-17201.

Research output: Contribution to journalArticle

Sasaki, S. ; Amaha, S. ; Asakawa, N. ; Eto, Mikio ; Tarucha, S. / Enhanced Kondo effect via tuned orbital degeneracy in a spin 1/2 artificial atom. In: Physical Review Letters. 2004 ; Vol. 93, No. 1. pp. 17205-17201.
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