スピン変換研究に向けた電気的超高速局所スピンプローブの開発と応用

2018 Fiscal Year Annual Research Report

• Project Area: nano spin conversion science
• Project/Area Number: 17H05187
• Research Institution: Tohoku University
• Principal Investigator: 大塚 朋廣 東北大学, 電気通信研究所, 准教授 (50588019)
• Project Period (FY): 2017-04-01 – 2019-03-31
• Keywords: 量子ドット / 局所スピン状態 / ナノ・マイクロデバイス

Outline of Annual Research Achievements

本研究では半導体量子ドット等の半導体ナノ構造を活用することにより、固体ナノ構造中の局所スピン状態およびその時間変化にアクセスできる電気的高速局所スピンプローブを開発し、これを用いて固体ナノ構造中の局所スピン現象を調べた。本年度は特に、電気的高速局所スピンプローブ手法の改良、およびこのスピンプローブを用いた固体ナノ構造中の局所スピン状態ダイナミクスの測定解析を中心に行った。
固体ナノ構造中でのスピン変換現象等をミクロに解明するためには、固体ナノ構造中の局所スピン状態に直接アクセスできる局所スピンプローブが有用となる。半導体量子ドット内にはスピンに依存した準位が存在し、この準位への電子のトンネルを調べることで、固体ナノ構造中の局所スピン状態を調べるプローブを実現することができる。またこのプローブを高周波測定技術と組み合わせることによって、ダイナミクスまで測定することが可能となる。この電気的高速局所スピンプローブを用いて、固体ナノ構造中の局所スピン状態およびそのダイナミクスを調べた。二次元電子ガスからなる電極と結合した半導体量子ドット中の電子スピンについて測定を行い、単一電子レベルで電荷状態とスピン状態の時間変化に差があることを明らかにした。この結果について、ミクロなモデルを構築して計算を行い、実験結果を再現することに成功した。また電気的高速局所スピンプローブの測定手法を活用することにより、他の固体ナノ構造中の局所スピン状態の観測と操作の研究についても貢献した。

Research Progress Status

平成30年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

平成30年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] ルール大学ボーフム(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: ルール大学ボーフム
• [Int'l Joint Research] バーゼル大学(スイス)
  • Country Name: SWITZERLAND
  • Counterpart Institution: バーゼル大学
• [Int'l Joint Research] ニューヨーク州立大学バッファロー校/ミシガン大学(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: ニューヨーク州立大学バッファロー校/ミシガン大学
• [Journal Article] Difference in charge and spin dynamics in a quantum dot-lead coupled system (2019)
  • Author(s): Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Journal Title: Physical Review B Volume: 99 Pages: 085402-1-5
  • DOI: 10.1103/PhysRevB.99.085402
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spin-orbit assisted spin funnels in DC transport through a physically defined pMOS double quantum dot (2019)
  • Author(s): Marian Marx, Jun Yoneda, Tomohiro Otsuka, Kenta Takeda, Yu Yamaoka, Takashi Nakajima, Sen Li, Akito Noiri, Tetsuo Kodera, and Seigo Tarucha
  • Journal Title: Japanese Journal of Applied Physics Volume: 58 Pages: SBBI07-1-5
  • DOI: 10.7567/1347-4065/ab01d6
  • Peer Reviewed
• [Journal Article] Quantum non-demolition measurement of an electron spin qubit (2019)
  • Author(s): Takashi Nakajima, Akito Noiri, Jun Yoneda, Matthieu R. Delbecq, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Giles Allison, Kento Kawasaki, Arne Ludwig, Andreas D. Wieck, Daniel Loss, and Seigo Tarucha
  • Journal Title: Nature Nanotechnology Volume: 未定 Pages: 未定
  • DOI: 10.1038/s41565-019-0426-x
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Coherent transfer of electron spin correlations assisted by dephasing noise (2018)
  • Author(s): Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Shinichi Amaha, Jun Yoneda, Akito Noiri, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, Xuedong Hu, Franco Nori, and Seigo Tarucha
  • Journal Title: Nature Communications Volume: 9 Pages: 2133-1-8
  • DOI: 10.1038/s41467-018-04544-7
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Four single-spin Rabi oscillations in a quadruple quantum dot (2018)
  • Author(s): Takumi Ito, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Akito Noiri, Giles Allison, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Journal Title: Applied Physics Letters Volume: 113 Pages: 093102-1-5
  • DOI: 10.1063/1.5040280
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Optimized electrical control of a Si/SiGe spin qubit in the presence of an induced frequency shift (2018)
  • Author(s): Kenta Takeda, Jun Yoneda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Giles Allison, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh, Shunri Oda, Tetsuo Kodera, and Seigo Tarucha
  • Journal Title: npj Quantum Information Volume: 4 Pages: 54-1-6
  • DOI: 10.1038/s41534-018-0105-z
  • Peer Reviewed / Open Access
• [Journal Article] A fast quantum interface between different spin qubit encodings (2018)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Giles Allison, Kento Kawasaki, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Journal Title: Nature Communications Volume: 9 Pages: 5066-1-7
  • DOI: 10.1038/s41467-018-07522-1
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Probing Spin Dynamics in Nanostructures Utilizing Quantum Dot Sensors (2018)
  • Author(s): Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: One-Day Symposium on Spintronic Properties of Graphene and Related 2D Materials
  • Int'l Joint Research
• [Presentation] Determination of the direction of the spin-orbit field in a physically-defined p-type MOS silicon double quantum dot (2018)
  • Author(s): Marian Marx, Jun Yoneda, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Sen Li, Yu Yamaoka, Takashi Nakajima, Akito Noiri, Daniel Loss, Tetsuo Kodera, and Seigo Tarucha
  • Organizer: Silicon Quantum Electronics Workshop 2018
  • Int'l Joint Research
• [Presentation] Charge and Spin Dynamics in a Quantum Dot-Lead Hybrid System (2018)
  • Author(s): Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Peter Stano, Shinichi Amaha, Jun Yoneda, Kenta Takeda, Giles Allison, Sen Li, Akito Noiri, Takumi Ito, Daniel Loss, Arne Ludwig, Andreas D. Wieck, and Seigo Tarucha
  • Organizer: International Symposium on Frontiers of Quantum Transport in Nano Science
  • Int'l Joint Research / Invited
• [Presentation] Angle dependent spin-orbit interaction in a physically defined silicon double quan-tum dot (2018)
  • Author(s): Marian Marx, Jun Yoneda, Tomohiro Otsuka, Kenta Takeda, Yu Yamaoka, Takashi Nakajima, Sen Li, Akito Noiri, Tetsuo Kodera, and Seigo Tarucha
  • Organizer: International Conference on Solid State Devices and Materials
  • Int'l Joint Research
• [Presentation] Control fidelities in isotopically natural and enriched silicon quantum dot qubits (2018)
  • Author(s): Kenta Takeda, Jun Yoneda, Tomohiro Otsuka, Takashi Nakajima, Matthieu R. Delbecq, Giles Allison, Akito Noiri, Yusuke Hoshi, Noritaka Usami, Kohei M. Itoh, Shunri Oda, Tetsuo Kodera, and Seigo Tarucha
  • Organizer: International Conference on Solid State Devices and Materials
  • Int'l Joint Research
• [Presentation] Coherent coupling between spin qubits of different codes (2018)
  • Author(s): Akito Noiri, Takashi Nakajima, Jun Yoneda, Matthieu R. Delbecq, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Shinichi Amaha, Giles Allison, Kento Kawasaki, Arne Ludwig, Andreas D. Wieck, Daniel Loss, and Seigo Tarucha
  • Organizer: International Conference on Superlattices, Nanostructures and Nanodevices
  • Int'l Joint Research
• [Presentation] Coherent control of a spin qubit in a frequency-locked loop (2018)
  • Author(s): Takashi Nakajima, Kento Kawasaki, Akito Noiri, Jun Yoneda, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Matthieu R. Delbecq, Shinichi Amaha, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss, and Seigo Tarucha
  • Organizer: International Conference on Superlattices, Nanostructures and Nanodevices
  • Int'l Joint Research
• [Presentation] 量子デバイスの高周波測定技術 (2018)
  • Author(s): 大塚朋廣
  • Organizer: 日本物理学会
  • Invited
• [Remarks] 研究成果報告用個人ページ
  • URL: http://ja.tomootsuka.net/