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Kondo effect and spin filtering in triangular artificial atoms

✍ Scribed by Gergely Zaránd; Arne Brataas; David Goldhaber-Gordon

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
106 KB
Volume
126
Category
Article
ISSN
0038-1098

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✦ Synopsis

We studied, strongly correlated states in triangular artificial atoms. Symmetry-driven orbital degeneracy of the single particle states can give rise to an SUð4Þ Kondo state with entangled orbital and spin degrees of freedom, and a characteristic phase shift d ¼ p=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.

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