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Elsevier, Solid State Communications, 8(126), p. 463-466

DOI: 10.1016/s0038-1098(03)00180-7

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Kondo effect and spin filtering in triangular artificial atoms

Journal article published in 2003 by Gergely Zarand, Arne Brataas ORCID, David Goldhaber-Gordon
This paper is available in a repository.
This paper is available in a repository.

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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)].