Studies on generation mechanism of coherent phonons with optical interferometric technique

• Project/Area Number: 16K05410
• 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 for Molecular Science
• Principal Investigator: OKANO Yasuaki 分子科学研究所, 技術課, 技術職員 (00393819)
• 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): 2016-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
• Keywords: コヒーレントフォノン / 光物性 / 超短パルス光 / 誘電率 / 量子ダイナミクス

Outline of Final Research Achievements

In this work, we have investigated generation mechanism of coherent phonons with a combination of a new experimental method using optical interferometric technique and theory focusing on phase information of the coherent phonons. By adapting our developed generation and detection theory of coherent phonons, especially for impulsive Raman scattering process, the amplitude and phase modulations of coherent phonons have been well explained when the phonons were coherently controlled with a precisely tuned pair of femtosecond laser pulses.

Academic Significance and Societal Importance of the Research Achievements

コヒーレントフォノンは、フォノンの振動周期よりも短い時間幅を持つ光パルスで励起することにより、振動のタイミングが揃ったフォノンの集団として形成される。物質の反射率・透過率などのマクロな物理量の変化としてフォノンダイナミクスを実験的に直接計測することができることから、半金属、半導体、超伝導物質など多くの物性研究に用いられてきた。本研究で用いた試料の一つであるダイヤモンドの光学フォノンは振動数が高く熱的な影響を受けにくいことから、近年、室温で動作する量子メモリーへの応用に向けた研究が行われている。このようにフォノン生成機構の解明は、物性研究のみならず量子デバイス開発研究への応用も期待される。

Research Products

• [Journal Article] Coherent Control Theory and Experiment of Optical Phonons in Diamond (2018)
  • Author(s): H. Sasaki, R. Tanaka, Y. Okano, F. Minami, Y. Kayanuma, Y. Shikano, K. G. Nakamura
  • Journal Title: Scientific Reports Volume: 8 Issue: 1
  • DOI: 10.1038/s41598-018-27734-1
  • Peer Reviewed / Open Access
• [Journal Article] Toward tangible quantum nature (2017)
  • Author(s): Shikano Yutaka
  • Journal Title: AIP Conference Proceedings Volume: 1871 Pages: 020001-020001
  • DOI: 10.1063/1.4996511
• [Journal Article] Spectrally resolved detection in transient-reflectivity measurements of coherent optical phonons in diamond (2016)
  • Author(s): Kazutaka G. Nakamura,Kazuma Ohya,Hiroshi Takahashi,Tetsuya Tsuruta,Hiroya Sasaki, Shin-ichi Uozumi, Katsura Norimatsu, Masahiro Kitajima, Yutaka Shikano, and Yosuke Kayanuma
  • Journal Title: Phys. Rev.B Volume: 94 Issue: 2
  • DOI: 10.1103/physrevb.94.024303
  • Peer Reviewed
• [Presentation] Optical manipulation of 40-THz coherent phonons in diamond (2019)
  • Author(s): Yasuaki Okano, Hiroya Sasaki, Riho Tanaka, Kazuma Ohya, Hiroshi Takahashi, Tetsuya Tsuruta, Hiroya Sasaki, Shin-ichi Uozumi, Katsura Norimatsu, Masahiro Kitajima, Fujio Minami, Yosuke Kayanuma, Yutaka Shikano, and Kazutaka G. Nakamura
  • Organizer: APS (American Physical Society) March Meeting 2019
  • Int'l Joint Research
• [Presentation] Dispersively coupled optomechanical system (2018)
  • Author(s): Yutaka Shikano
  • Organizer: International Conference on challeanges in Quantum Information Science at National Institute for Informatics
  • Int'l Joint Research
• [Presentation] Quantum Dynamical Simulation by Quantum Walk (2018)
  • Author(s): Yutaka Shikano
  • Organizer: Towards Ultimate quantum theory (UQT) at Linnaeus University
  • Int'l Joint Research / Invited
• [Presentation] Dispersively coupled optomechanical system (2018)
  • Author(s): Yutaka Shikano
  • Organizer: the University of Birmingham Gravitational Wave Group
  • Int'l Joint Research
• [Presentation] Coherent Control of 40 THz optical phonons in diamond (2018)
  • Author(s): Yasuaki Okano, Hiroya Sasaki, Riho Tanaka, Fujio Minami, Yosuke Kayanuma, Yutaka Shikano, Kasutaka G. Nakamura
  • Organizer: International Conference on Quantum & Nonlinear Optics
  • Int'l Joint Research
• [Presentation] Coherent Control of Electron-Phonon Coupled States in a GaAs crystal using Phase-locked Femtosecond Pulses (2018)
  • Author(s): Kasutaka G. Nakamura, Rintaro Kase, Yuki Okuda, Takashi Kitashima, Yu Mishima, Fujio Minami, Yosuke Kayanuma, Yutaka Shikano
  • Organizer: International Conference on Quantum & Nonlinear Optics
  • Int'l Joint Research / Invited
• [Presentation] コヒーレントフォノンのコヒーレント制御に関する理論 (2018)
  • Author(s): 鹿野 豊, 佐々木 寛弥, 田中 利歩, 岡野 泰彬, 南 不二雄, 萱沼 洋輔, 中村 一隆
  • Organizer: 第65回 応用物理学会 春季学術講演会
• [Presentation] ダイヤモンド中のコヒーレントフォノンに対する量子制御 (2018)
  • Author(s): 佐々木 寛弥, 田中 利歩, 岡野 泰彬, 南 不二雄, 萱沼 洋輔, 鹿野 豊, 中村 一隆
  • Organizer: 日本物理学会 第73回年次大会
• [Presentation] Quantum Phase through Quantum Tunneling (2017)
  • Author(s): Yutaka Shikano
  • Organizer: 3rd International Conference on Quantum Foundations
  • Int'l Joint Research / Invited
• [Presentation] Coherent control of optical phonons in diamond using a pair of femtosecond pulses (2017)
  • Author(s): Yasuaki Okano, Hiroya Sasaki, Riho Tanaka, Fujio Minami, Yosuke Kayanuma, Yutaka Shikano, Kazutaka G Nakamura
  • Organizer: 第37回量子情報技術研究会