2013 Fiscal Year Final Research Report
Generation and detection of nuclear spin entanglement in semiconductor quantum dots
| Project/Area Number |
23340091
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Condensed matter physics I
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| Research Institution | The Institute of Physical and Chemical Research |
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Principal Investigator |
ONO Keiji 独立行政法人理化学研究所, 河野低温物理研究室, 専任研究員 (00302802)
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| Co-Investigator(Renkei-kenkyūsha) |
AMAHA Shinichi 独立行政法人理化学研究所, 創発物性科学研究センター, 研究員 (90587924)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | 半導体 / 量子ドット |
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| Research Abstract |
We observe a singlet spin blockade (SSB) in two-electron vertical double quantum dots where the single-electron transport is blocked for spin singlet electrons. In contrast to the conventional Pauli spin blockade with spin triplet electrons, this singlet spin blockade is observed under high magnetic field, where the doubly occupied states in one of the dots go beyond the singlet-triplet ground-state transition. The SSB region in Coulomb diamond measurements is in agreement
with the two-electron excitation spectrum. A leakage current of 10 pA order is observed in SSB, consistent with the spin singlet lifetime due to random nuclear spin fluctuations. This results are published in Appl.Phys.Lett
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[Presentation] 縦横結合 4 重量子ドットの電気伝導特性2014
Author(s)
天羽真一 , M. Delbecq, 中島峻 , 大塚朋廣 ,大野圭司 , D. G. Austing, 羽田野剛司 , 樽茶清悟
Organizer
日本物理学会第69回年次大会
Place of Presentation
東海大学, 湘南キャンパス, 平塚市
Year and Date
20140317-20
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