期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.016803
关键词
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资金
- Japan Society for the Promotion of Science (JSPS) [23740248, 22740191]
- JSPS [19104007]
- Ministry of Education Culture, Sports, Science and Technology, Japan [21102003]
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST), ERATO-JST [080300000477]
- IARPA project Multi-Qubit Coherent Operations'' through Copenhagen University
- Grants-in-Aid for Scientific Research [22740191, 23740248, 19104007, 21102003] Funding Source: KAKEN
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. DOI: 10.1103/PhysRevLett.110.016803
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