Coherent control of electron-phonon coupled quantum system using interferometric transient reflectivity measurement

• Project/Area Number: 17H02797
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Optical engineering, Photon science
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: Nakamura Kazutaka 東京工業大学, 科学技術創成研究院, 准教授 (20302979)
• Co-Investigator(Kenkyū-buntansha): 鹿野 豊 慶應義塾大学, 理工学研究科(矢上), 特任准教授 (80634691)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000); Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000); Fiscal Year 2018: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000); Fiscal Year 2017: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
• Keywords: コヒーレント制御 / 量子コヒーレンス / コヒーレントフォノン / 位相制御パルス / 電子フォノン結合系 / フェムト秒 / 超高速分光 / 半導体

Outline of Final Research Achievements

Quantum coherence in an electron-phonon coupled system of a GaAs single crystal is measured and controlled using interferometric transient reflectivity measurement with relative phase-locked optical pulses. The pulse is controlled with attoseocond precision. We observe that the electronic coherence is preserved more than 50 femtoseconds in n-GaAs(100) at 90 K.　The observed collapse and revival feature in the electronic coherence is found to be due to a quantum-path interference in the impulsive stimulated Raman scattering process by the comparison the experimental results and quantum model calculation.

Academic Significance and Societal Importance of the Research Achievements

量子コヒーレンスは固体では直ぐに消失することは知られているが、その保持時間の定量的な評価が困難であった。本研究により、アト秒精度で位相制御したパルス対を用いた干渉型過渡反射率計測をバルク固体中で量子コヒーレンスの保持時間の定量的な評価を可能となったことは、量子物理学において学術的な意義が大きいとともに、固体をベースとした量子デバイス開発にも有用な情報を与えるものである。

Research Products

• [Int'l Joint Research] Institute of Fluid Physics(中国)
• [Int'l Joint Research] Institute of Solid State Physics(ロシア連邦)
• [Journal Article] Ultrafast quantum-path interferometry revealing the generation process of coherent phonons (2019)
  • Author(s): K. G. Nakamura, K. Yokota, Y. Okuda, R. Kase, T. Kitashima, Y. Mishima, Y. Shikano, and Y. Kayanuma
  • Journal Title: Physical Review B Volume: 99
  • Peer Reviewed
• [Journal Article] Temperature effect on the coupling between coherent longitudinal phonons and plasmons in n-type and p-type GaAs (2018)
  • Author(s): Hu Jianbo、Zhang Hang、Sun Yi、Misochko Oleg V.、Nakamura Kazutaka G.
  • Journal Title: Physical Review B Volume: 97 Issue: 16
  • DOI: 10.1103/physrevb.97.165307
  • Peer Reviewed / Int'l Joint Research
• [Presentation] 量子経路干渉分光法による誘導ラマン散乱強度の飽和効果 (2019)
  • Author(s): 萱沼洋輔、北島誉士、松本啓、中村一隆
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] Coherent control of electron-phonon coupled states in GaAs using relative phase-locked femtosecond pulses (2019)
  • Author(s): K. G. Nakamura
  • Organizer: International Conference of Mater and Radiation in Extreme (ICMRE)
  • Int'l Joint Research / Invited
• [Presentation] GaAs/AlGaAs量子井戸中の励起子コヒーレント過渡課程 (2019)
  • Author(s): 古庄裕也、笹瀬悠斗、南不二雄、中村一隆
  • Organizer: 第３０回光物性研究会
• [Presentation] イオン照射GaAs単結晶における電子フォノン結合系の量子コヒーレンス計測 (2019)
  • Author(s): 丸橋司、萱沼洋輔、松本啓、木全哲也、鹿野豊、山本春也、南不二雄、中村一隆
  • Organizer: 第３０回光物性研究会
• [Presentation] 超格子GaAs/AlAsにおける電子フォノン結合系の量子コヒーレンス計測 (2019)
  • Author(s): 三島遊、北島誉士、萱沼洋輔、南不二雄、中村一隆
  • Organizer: 第６６回応用物理学春季学術講演会
• [Presentation] GaAs結晶での過渡反射率計測における光応答のプローブ偏光角度依存性 (2018)
  • Author(s): 松本啓、北島誉士、三島遊、萱沼洋輔、中村一隆
  • Organizer: 第７９回応用物理学会秋季学術講演会
• [Presentation] 交差偏光パルス対を用いたGaAs単結晶フォノンのコヒーレント制御 (2018)
  • Author(s): 北島誉士、三島遊、松本啓、萱沼洋輔、中村一隆
  • Organizer: 第７９回応用物理学会秋季学術講演会
• [Presentation] GaAs中の光学フォノンの二次元コヒーレント分光 (2018)
  • Author(s): 笹瀬悠斗、南不二雄、中村一隆
  • Organizer: 第７９回応用物理学会秋季学術講演会
• [Presentation] Dual-pulse quantum path interference reveals the generation dynamics of coherent phonons in GaAs (2018)
  • Author(s): Y. Kayanuma and K.G. Nakamura
  • Organizer: The 9th Shanghai Tokyo Advanced Research on Intense Laser Science
  • Int'l Joint Research / Invited
• [Presentation] 超短パルスレーザーを用いた原子運動の実時間計測 (2018)
  • Author(s): 中村一隆
  • Organizer: 光・量子ビーム科学合同シンポジウム2018
• [Presentation] Coherent control of optical phonons using femtosecond pulses (2018)
  • Author(s): K. Nakamura
  • Organizer: Conference on Laser and Synchrotron Radiation Combination Experiment LSC 2018
  • Int'l Joint Research / Invited
• [Presentation] 位相ロック２連パルス励起で見たコヒーレントフォノン生成の新しい描像 (2018)
  • Author(s): 萱沼洋輔、中村一隆
  • Organizer: 日本物理学会第７３回年次大会
• [Presentation] Coherent control of electron-phonon coupled states in a GaAs crystal using phase-locked femtosecond pulses (2018)
  • Author(s): K. G. Nakamura, R. Kase, Y. Okuda, T. Kitashima, Y. Mishima, F. Minami, Y. Kayanma, and Y. Shikano
  • Organizer: QNO 2108 International Conference on Quantum & Nonlinear Optics
  • Int'l Joint Research / Invited
• [Presentation] アト秒例御２連パルスによるコヒーレントフォノン生成における量子遷移経路干渉 (2017)
  • Author(s): 萱沼洋輔、奥田悠貴、加瀬麟太郎、中村一隆
  • Organizer: 日本物理学会２０１７年秋季大会
• [Presentation] Time-domain interference of electron-phonon coupled states in n-type GaAs using relative phase locked femtosecond pulses (2017)
  • Author(s): K. G. Nakamura, R. Kase, Y. Okuda, F. Minami, Y. Shikano, and Y. Kayanuma
  • Organizer: 10th International Symposium of Science and Technology for Advanced Ceramics
  • Int'l Joint Research
• [Presentation] Sub-femtosecond coherent control of electron-phonon coupled sate in GaAs by phase-locked dual pulse (2017)
  • Author(s): Y. Kayanuma, K. Yokota, and K. G. Nakamura
  • Organizer: 2017 CLEO Pacific Rim Conference
  • Int'l Joint Research
• [Presentation] Attosecond coherent control of electron-phonon coupled systems with dual optical pumping (2017)
  • Author(s): Y. Kayanuma and K. G. Nakamura
  • Organizer: The 8th Shanghai Tokyo Advanced Research on Intense Laser Science
  • Int'l Joint Research / Invited
• [Presentation] Quantum Phase through Quantum Tunneling (2017)
  • Author(s): Yutaka Shikano
  • Organizer: 3rd International Conference on Quantum Foundations
  • Int'l Joint Research / Invited
• [Book] Quantum Phononics: Introduction to Ultrafast Dynamics of Optical Phonons (2019)
  • Author(s): Kazutaka Nakamura
  • Total Pages: 142
  • Publisher: Springer-Nature Switzerland AG
  • ISBN: 9783030119232
• [Remarks] 超短パルス光を用い固体中の量子経路干渉を観測
  • URL: https://www.titech.ac.jp/news/2019/044341.html