Abstract:
:The Kondo effect--a many-body phenomenon in condensed-matter physics involving the interaction between a localized spin and free electrons--was discovered in metals containing small amounts of magnetic impurities, although it is now recognized to be of fundamental importance in a wide class of correlated electron systems. In fabricated structures, the control of single, localized spins is of technological relevance for nanoscale electronics. Experiments have already demonstrated artificial realizations of isolated magnetic impurities at metallic surfaces, nanoscale magnets, controlled transitions between two-electron singlet and triplet states, and a tunable Kondo effect in semiconductor quantum dots. Here we report an unexpected Kondo effect in a few-electron quantum dot containing singlet and triplet spin states, whose energy difference can be tuned with a magnetic field. We observe the effect for an even number of electrons, when the singlet and triplet states are degenerate. The characteristic energy scale is much larger than in the ordinary spin-1/2 case.
journal_name
Naturejournal_title
Natureauthors
Sasaki S,De Franceschi S,Elzerman JM,van der Wiel WG,Eto M,Tarucha S,Kouwenhoven LPdoi
10.1038/35015509keywords:
subject
Has Abstractpub_date
2000-06-15 00:00:00pages
764-7issue
6788eissn
0028-0836issn
1476-4687journal_volume
405pub_type
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