Kondo effect and spin filtering in triangular artificial atoms

Gergely Zaránd, Arne Brataas, David Goldhaber-Gordon

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Abstract

We studied, strongly correlated states in triangular artificial atoms. Symmetry-driven orbital degeneracy of the single particle states can give rise to an SU(4) Kondo state with entangled orbital and spin degrees of freedom, and a characteristic phase shift δ=π/4. Upon application of a Zeeman field, a purely orbital Kondo state is formed with somewhat smaller Kondo temperature and a fully polarized current through the device. The Kondo temperatures are in the measurable range. The triangular atom also provides a tool to systematically study the singlet-triplet transitions observed in recent experiments [Phys. Rev. Lett., 88 (2002) 126803, cond-mat/0208268 (2002)].

Original languageEnglish
Pages (from-to)463-466
Number of pages4
JournalSolid State Communications
Volume126
Issue number8
DOIs
Publication statusPublished - May 1 2003

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Keywords

  • A. Quantum dots
  • D. Kondo effects

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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