Spin hot spots in semiconductor quantum dots

• Project/Area Number: 16K05411
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics I
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: STANO PETER 国立研究開発法人理化学研究所, 創発物性科学研究センター, 上級研究員 (10722746)
• Research Collaborator: Zumbühl Dominik University of Basel, Prof. ; Gendiar Andrej Slovak Academy of Sciences, Institute of Physics, Dr. ; RIKEN Daniel Loss , Prof.
• Project Period (FY): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2018: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2016: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
• Keywords: spin-orbit coupling / decoherence / quantum dot / spin qubit / nuclear spins / スピン 物性 (半導体) / スピン物性（半導体）

Outline of Final Research Achievements

The goal of this research was to propose ways for a characterization of the spin-orbit fields in semiconductor quantum dot devices. The idea was based on exploiting anisotropies of the spin relaxation rate with respect to the direction of the external magnetic field and the device orientation with respect to the crystal axes. We have developed such a method. It uses strong magnetic field and allows to uncover details of the quantum dot. The results of the research have been published in international journals including Physical Review Letters and Nature Communications.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的重要性は、半導体量子ドットにおけるスピン軌道相互作用について新しい評価手法を開発、実証したことである。これにより従来は不可能と思われてきた情報を推測することが可能となった。例えば、固体中に閉じ込められた単一電子の波動関数に関する情報である。この新しい手法を用いて、ライフタイムの長い量子ビットや、操作時間の短い量子ビット等、優れた特性を持つ半導体量子ビットの設計と作製を行うことができる。

Research Products

• [Int'l Joint Research] University of Basel(スイス)
• [Journal Article] Orbital effects of a strong in-plane magnetic field on a gate-defined quantum dot (2019)
  • Author(s): Stano Peter、Hsu Chen-Hsuan、Camenzind Leon C.、Yu Liuqi、Zumbuhl Dominik、Loss Daniel
  • Journal Title: Physical Review B Volume: 99 Issue: 8 Pages: 085308-085308
  • DOI: 10.1103/physrevb.99.085308
  • Peer Reviewed / Int'l Joint Research
• [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 Issue: 8 Pages: 85402-85402
  • DOI: 10.1103/physrevb.99.085402
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Spectroscopy of Quantum-Dot Orbitals with In-Plane Magnetic Fields (2019)
  • Author(s): L. C. Camenzind, L. Yu, P. Stano, J. Zimmerman, A. C. Gossard, D. Loss, D. M. Zumbuhl
  • Journal Title: accepted for Physical Review Letters Volume: arxiv
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] g-factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field (2018)
  • Author(s): Stano Peter、Hsu Chen-Hsuan、Serina Marcel、Camenzind Leon C.、Zumbuhl Dominik M.、Loss Daniel
  • Journal Title: Physical Review B Volume: 98 Issue: 19 Pages: 195314-195314
  • DOI: 10.1103/physrevb.98.195314
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot (2018)
  • Author(s): Camenzind Leon C.、Yu Liuqi、Stano Peter、Zimmerman Jeramy D.、Gossard Arthur C.、Loss Daniel、Zumbuhl Dominik M.
  • Journal Title: Nature Communications Volume: 9 Issue: 1 Pages: 3454-3454
  • DOI: 10.1038/s41467-018-05879-x
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Dipolelike dynamical nuclear spin polarization around a quantum point contact (2018)
  • Author(s): Peter Stano, Tomosuke Aono, Minoru Kawamura
  • Journal Title: Phys. Rev. B Volume: 97 Issue: 7 Pages: 1-16
  • DOI: 10.1103/physrevb.97.075440
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Higher-order spin and charge dynamics in a quantum dot-lead hybrid system (2017)
  • Author(s): Otsuka Tomohiro、Nakajima Takashi、Delbecq Matthieu R.、Amaha Shinichi、Yoneda Jun、Takeda Kenta、Allison Giles、Stano Peter、Noiri Akito、Ito Takumi、Loss Daniel、Ludwig Arne、Wieck Andreas D.、Tarucha Seigo
  • Journal Title: Scientific Reports Volume: 7 Issue: 1 Pages: 1-7
  • DOI: 10.1038/s41598-017-12217-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array (2017)
  • Author(s): Nakajima Takashi、Delbecq Matthieu R.、Otsuka Tomohiro、Stano Peter、Amaha Shinichi、Yoneda Jun、Noiri Akito、Kawasaki Kento、Takeda Kenta、Allison Giles、Ludwig Arne、Wieck Andreas D.、Loss Daniel、Tarucha Seigo
  • Journal Title: Physical Review Letters Volume: 119 Issue: 1 Pages: 1-6
  • DOI: 10.1103/physrevlett.119.017701
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Signatures of Hyperfine, Spin-Orbit, and Decoherence Effects in a Pauli Spin Blockade (2016)
  • Author(s): T. Fujita, P. Stano, G. Allison, K. Morimoto, Y. Sato, M. Larsson, J.-H. Park, A. Ludwig, A.D. Wieck, A. Oiwa, and S. Tarucha
  • Journal Title: Physical Review Letters Volume: 117 Issue: 20 Pages: 206802-206802
  • DOI: 10.1103/physrevlett.117.206802
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Optimal geometry of lateral GaAs and Si/SiGe quantum dots for electrical control of spin qubits (2016)
  • Author(s): Malkoc, O.
  • Journal Title: Physical Review B Volume: 93 Issue: 23 Pages: 235413-235413
  • DOI: 10.1103/physrevb.93.235413
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Fractional boundary charges in quantum dot arrays with density modulation (2016)
  • Author(s): J.-H. Park, G. Yang, J. Klinovaja, P. Stano, D. Loss
  • Journal Title: Phys. Rev. B Volume: 94 Issue: 7 Pages: 075416-075416
  • DOI: 10.1103/physrevb.94.075416
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Presentation] Effects of an in-plane magnetic field on a quasi-2D quantum dot (2018)
  • Author(s): P. Stano
  • Organizer: China-Japan International Workshop on Quantum Technologies, QTech2018, Hefei, China, 23. August 2018
  • Int'l Joint Research / Invited
• [Presentation] Theory of g-factor in quantum dots (2018)
  • Author(s): P. Stano
  • Organizer: Nasu 8th Summer School on Semiconductor/Superconducting Quantum Coherence Effects and Quantum Information, Nasu, Tochigi, Japan, 4. September 2018
• [Presentation] Orbital effects of an in-plane field in a 2DEG quantum dot (2018)
  • Author(s): P. Stano
  • Organizer: APS March Meeting, Los Angeles, USA, 8. March 2018
  • Int'l Joint Research
• [Presentation] Effects of an In-plane Magnetic Field on the Electron g-factor in a 2DEG Quantum Dot (2018)
  • Author(s): Ch.-H. Hsu (with P. Stano, and D. Loss)
  • Organizer: American Physical Society March Meeting, Los Angeles, United States, 8. March 2018
  • Int'l Joint Research
• [Presentation] Theory and modeling of gated quantum dot qubits in GaAs: orbital and spin effects of the magnetic field (2018)
  • Author(s): P. Stano
  • Organizer: Spin Qubit 4, Steigenberger Inselhotel, Konstanz, Germany, 14. September 2018
  • Int'l Joint Research / Invited
• [Presentation] Theory and modeling of gated quantum dot qubits in GaAs: orbital and spin effects of the magnetic field (2018)
  • Author(s): P. Stano
  • Organizer: 10th International conference Solid State Surfaces and Interfaces, Smolenice, Slovakia, 20. November 2018
  • Int'l Joint Research
• [Presentation] How to measure the spin-orbit interactions in a quantum dot (2017)
  • Author(s): Stano Peter
  • Organizer: SFB seminar (2. May), University of Regensburg, Germany
• [Presentation] Spin relaxation in quantum dots (2017)
  • Author(s): Stano Peter
  • Organizer: 7th Summer School on Semiconductor/Superconducting Quantum Coherence Effect and Quantum Information, Hotel LaforetShuzenji, Izu, Shizuoka
• [Presentation] Nuclear spins in quantum dot spin qubits (2017)
  • Author(s): Stano Peter
  • Organizer: International Symposium on Hybrid Quantum Systems (HQS 2017), Miyagi Zao Royal Hotel, Zao, Miyagi
• [Presentation] Dephasing of a Singlet-Triplet Qubit in a Gated GaAs Dot due to Non-Ergodic Hyperfine Noise (2016)
  • Author(s): Stano, P.
  • Organizer: Spin Coherence and Topological Order in Semiconductor Nanosystems
  • Place of Presentation: CSRC, Beijing, China
  • Year and Date: 2016-11-03
  • Int'l Joint Research / Invited
• [Presentation] Fractional charges in quantum dot arrays with density modulation (2016)
  • Author(s): Stano, P.
  • Organizer: Nasu 6th Summer School on Semiconductor/Superconducting Quantum Coherence Effects and Quantum Information
  • Place of Presentation: Nasu, Tochigi, Japan
  • Year and Date: 2016-09-23
• [Presentation] Footprints of hyperfine, spin-orbit, and decoherence effects in Pauli spin blockade (2016)
  • Author(s): Stano, P.
  • Organizer: 33rd International Conference on the Physics of Semiconductors (ICPS2016)
  • Place of Presentation: International Convention Center, Beijing, China
  • Year and Date: 2016-08-04
  • Int'l Joint Research
• [Presentation] Fractional charges in quantum dot arrays with density modulation (2016)
  • Author(s): Stano, P.
  • Organizer: 20th Symposium on Topological Quantum Information
  • Place of Presentation: University of Athens, Greece
  • Year and Date: 2016-05-25
  • Int'l Joint Research / Invited
• [Presentation] Fractional charges in quantum dot arrays with density modulation (2016)
  • Author(s): Stano, P.
  • Organizer: China-Japan International Workshop on Quantum Technologies (QTech2016)
  • Place of Presentation: Peking University, Beijing, China
  • Year and Date: 2016-05-13
  • Int'l Joint Research / Invited