Two- and three-electron Pauli spin blockade in series-coupled triple quantum dots

We investigate two- and three-electron spin blockade in three vertical quantum dots (QDs) coupled in series. Two-electron spin blockade is found in a region where sequential tunneling through all QDs is forbidden but tunneling involving virtual hopping through an empty QD is allowed. It is observed...

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Bibliographic Details
Published in:Physical review letters 2013-01, Vol.110 (1), p.016803-016803, Article 016803
Main Authors: Amaha, S, Izumida, W, Hatano, T, Teraoka, S, Tarucha, S, Gupta, J A, Austing, D G
Format: Article
Language:English
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Summary:We investigate two- and three-electron spin blockade in three vertical quantum dots (QDs) coupled in series. Two-electron spin blockade is found in a region where sequential tunneling through all QDs is forbidden but tunneling involving virtual hopping through an empty QD is allowed. It is observed only for the hole cycle with a distinct bias threshold for access to the triplet state. Three-electron spin blockade involving the quadruplet state is observed for nonequibilium conditions where sequential tunneling is allowed and the triplet state is accessible. Our results shine light on the importance of the nonequibilium conditions to obtain sufficient population of triplet and quadruplet states necessary for spin blockade.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.110.016803