Kondo effect and spin filtering in triangular artificial atoms
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چکیده
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 1⁄4 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. Rev. Lett., 88 (2002) 126803, cond-mat/0208268 (2002)]. q 2003 Elsevier Science Ltd. All rights reserved. PACS: 75.20.Hr; 71.27.þa; 72.15.Qm
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تاریخ انتشار 2003