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

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

Research output: Contribution to journalArticle

105 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
Article number017205
Pages (from-to)017205-1-017205-4
JournalPhysical review letters
Volume93
Issue number1
DOIs
Publication statusPublished - 2004 Jul 2

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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