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2009 Fiscal Year Annual Research Report

光誘起構造相転移動力学の研究

Research Project

Project/Area Number 19001002
Research InstitutionOsaka University

Principal Investigator

谷村 克己  Osaka University, 産業科学研究所, 教授 (00135328)

Co-Investigator(Kenkyū-buntansha) 那須 奎一郎  大学共同利用機関法人高エネルギー加速器研究機構, 物質構造科学研究所, 教授 (90114595)
吉田 博  大阪大学, 基礎工学研究科, 教授 (30133929)
金崎 順一  大阪大学, 産業科学研究所, 准教授 (80204535)
石丸 学  大阪大学, 産業科学研究所, 准教授 (00264086)
楊 金峰  大阪大学, 産業科学研究所, 准教授 (90362631)
Keywords光誘起構造相転移 / フェムト秒時間分解分光 / 時間分解電子線回折 / 走査型トンネル顕微鏡 / 励起状態第一原理分子動力学 / 励起状態動力学 / RFフォトカソード / 電子顕微鏡
Research Abstract

本年度は、本研究最大の課題の一つである、世界最高性能を有する超高速時間分解電子回折装置の完成という大きな成果を挙げるとともに、以下に述べる重要な成果を達成した。
まず、完成した超高速時間分解電子回折装置は、時間分解能90fsを有し、サブミクロンの厚さの種々の試料に対して極めて鮮明な透過電子回折パターンを得るに十分な良好なビーム特性を有しており、更に試作した検出器は極めて感度が高く、単一パルスでの検出も実現可能である。このタイプの装置としては世界最高性能を示し、現在これを駆使した精力的な実験を推進している。
第二に、グラファイトの光誘起相転移によってのみ発生する第三の炭素凝縮相Daiaphiteの発見という昨年度の成果に立脚し、励起波長を可視~紫外領域の広い範囲に拡張して体系的な相転移効率に関する実験的知見を得るとともに、理論的研究によって、初期条件敏感性および生成効率の非線形性のミクロな起源、更には、層間結合発生の動力学を解明した。また、走査型トンネル顕微鏡像に対する第一原理計算手法に基づく解明を進め、Daiaphiteの電子状態に対する明確な知見を獲得した。これらは既にPhysical Review誌に発表済みもしくは投稿中である。
第三に、構造相転移を誘起する励起状態の超高速緩和過程を、フェムト秒可視赤外分光法、フェムト秒2光子光電子分光法を駆使して研究を展開し、(1)高密度励起下で発生する電子・正孔プラズマ状態の検出とその動特性の解明、(2)運動量とエネルギーの二次元光電子検出装置の性能向上によって、高密度励起下での電子系および正孔系の状態変化の直接的観察と動特性の解明、を達成した。これらは、現在論文執筆中である。
以上のように、全分担者の協力によって本研究は予想以上に順調に進行しており、来年度以降もより多くの画期的先進的成果を達成すべく研究を推進する。

  • Research Products

    (42 results)

All 2010 2009 Other

All Journal Article (22 results) (of which Peer Reviewed: 22 results) Presentation (19 results) Remarks (1 results)

  • [Journal Article] Femtosecond pulse radiolysis and femtosecond electron diffraction2010

    • Author(s)
      J.Yang, K.Kan, T.Kondoh, Y.Yoshida, K.Tanimura, J.Urakawa
    • Journal Title

      Nucl.Instrum.Method A (in press)

    • Peer Reviewed
  • [Journal Article] First principle theory of dilute magnetic semiconductors2010

    • Author(s)
      K.Sato, L.Bergqvist, J.Kudnovsky, P.H.Dederichs, O.Eriksson, I.Turek, B.Sanyal, G.Bouzerar, H.Katayama-Yoshida, V.A.Dinh, T.Fukushima, H.Kizaki, R.Zeller
    • Journal Title

      Rev.Mod.Phys. (in press)

    • Peer Reviewed
  • [Journal Article] First principle theory of dilute magnetic semiconductors2010

    • Author(s)
      K.Sato, L.Bergqvist, J.Kudnovsky, P.H.Dederichs, O.Eriksson, I.Turek, B.Sanyal, G.Bouzerar, H.Katayama-Yoshida, V.A.Dinh, T.Fukushima, H.Kizaki, R Zeller
    • Journal Title

      Rev.Mod.Phys. (in press)

    • Peer Reviewed
  • [Journal Article] Dynamics of bulk-to-surface electron transitions on Si(001)-(2x1) studied by time-resolved two-photon photoemission spectroscopy2009

    • Author(s)
      S.Tanaka, T.Ichibayashi, K.Tanimura
    • Journal Title

      Phys.Rev.B 79

      Pages: 155313-1-8

    • Peer Reviewed
  • [Journal Article] ダイヤファイトと可視光誘起グラファイトーダイヤモンド相転移初期過程の理論2009

    • Author(s)
      大西宏昌, 谷村克己, 那須奎一郎
    • Journal Title

      固体物理 44

      Pages: 257-265

    • Peer Reviewed
  • [Journal Article] 100-femtosecond MeV electron source for ultrafast electron diffraction2009

    • Author(s)
      J.Yang, K.Kan, N.Naruse, Y.Yoshida, K.Tanimura, J.Urakawa
    • Journal Title

      Radiat.Phys.Chem. 78

      Pages: 1106-1111

    • Peer Reviewed
  • [Journal Article] Photo-induced domain type collective structural changes with inter-layer σ-bonds in the visible region of graphite2009

    • Author(s)
      H.Ohnishi, K.Nasu
    • Journal Title

      Phys.Rev.B 79

      Pages: 054111-1-6

    • Peer Reviewed
  • [Journal Article] Density functional study of a photo-induced phase in graphite2009

    • Author(s)
      H.Ohnishi, K.Nasu
    • Journal Title

      J.Physics : Conference Series 148

      Pages: 012059-1-3

    • Peer Reviewed
  • [Journal Article] Early history and theoretical problems of photo-induced structural phase transitions2009

    • Author(s)
      K.Nasu
    • Journal Title

      J.Physics : Conference Series 148

      Pages: 012057-1-3

    • Peer Reviewed
  • [Journal Article] Generation and growth of sp^3-bonded domains by visible photon irradiation of graphite2009

    • Author(s)
      H.Ohnishi, K.Nasu
    • Journal Title

      Phys.Rev.B 80

      Pages: 014112-1-8

    • Peer Reviewed
  • [Journal Article] Numerical simulation on the dynamics of photo-induced cooperative phenomena in molecular crystals2009

    • Author(s)
      K.Ishida, K.Nasu
    • Journal Title

      Comput.Phys.Commun. 180

      Pages: 1489-1494

    • Peer Reviewed
  • [Journal Article] Site-dependent lattice dynamics of photo-induced structural change2009

    • Author(s)
      K.Ishida, K.Nasu
    • Journal Title

      Phys.Rev.B 80

      Pages: 140301(R)-1-4

    • Peer Reviewed
  • [Journal Article] Early-stage real-time dynamics of interlayer sp^3-bond formation by visible-light irradiation of graphite2009

    • Author(s)
      K.Nishioka, K.Nasu
    • Journal Title

      Phys.Rev.B 80

      Pages: 235420-1-8

    • Peer Reviewed
  • [Journal Article] Quantum Monte Carlo study on speckle variation due to photo-relaxation of ferroelectric clusters in para-electric barium titanate2009

    • Author(s)
      Kai Ji, K.Namikawa, Hang Zheng, K.Nasu
    • Journal Title

      Phys.Rev.B 79

      Pages: 144304-1-8

    • Peer Reviewed
  • [Journal Article] Variational Density-Functional Perturbation Theory with Ultrasoft Pseudopotentials2009

    • Author(s)
      I.Hamada, T.Oda, N.Suzuki, H Katayama-Yoshida
    • Journal Title

      J.Comput.Theor.Nanos. 6

      Pages: 2550-2558

    • Peer Reviewed
  • [Journal Article] First-principles calculations of electronic structure on (Ti,Co)O-2 within self-interaction-corrected LDA2009

    • Author(s)
      H.Kizaki, M.Toyoda, K.Sato, H.Katayama-Yoshida
    • Journal Title

      Thin Solid Films 518

      Pages: 1194-1196

    • Peer Reviewed
  • [Journal Article] First-Principles Study on Electronic Structure and Spin State of Rutile (Ti,Co)O-2 by Self-Interaction-Corrected Local Density Approximation : Roleof Oxygen Vacancy2009

    • Author(s)
      H.Kizaki, M.Toyoda, K.Sato, H.Katayama-Yoshida
    • Journal Title

      Appl.phys.Express 2

      Pages: 053004-1-3

    • Peer Reviewed
  • [Journal Article] Transmission electron microscopy study of an electron-beam-induced phase transformation of niobium nitride2009

    • Author(s)
      J.H.Won, J.A.Valdez, M.Naito, M.Ishimaru, K.E.Sickafus
    • Journal Title

      Scripa Mater. 60

      Pages: 799-802

    • Peer Reviewed
  • [Journal Article] Early stage of the crystallization in amorphous Fe-Si layer : Formation and growth of metastable α-FeSi_22009

    • Author(s)
      M.Naito, M.Ishimaru
    • Journal Title

      Nucl.Instr.and Meth.B 267

      Pages: 1290-1293

    • Peer Reviewed
  • [Journal Article] Ion-beam-induced chemical disorder in GaN2009

    • Author(s)
      M.Ishimaru, Y.Zhang, W.J.Weber
    • Journal Title

      J.Appl.Phys. 106

      Pages: 053513-1-4

    • Peer Reviewed
  • [Journal Article] Effect of periodicity of the two-dimensional vacancy planes on the thermal conductivity of bulk Ga_2Te_32009

    • Author(s)
      C.-E.Kim, K.Kurosaki, M.Ishimaru, D.-Y.Jung, H.Muta, S.Yamanaka
    • Journal Title

      Phys.Status Solidi (RRL) 3

      Pages: 221-223

    • Peer Reviewed
  • [Journal Article] Formation process of β-FeSi_2 from amorphous Fe-Si synthesized by ion implantation : Fe concentration dependence2009

    • Author(s)
      M.Naito, M.Ishimaru
    • Journal Title

      J.Mictosc 236

      Pages: 123-127

    • Peer Reviewed
  • [Presentation] Ultrafast dynamics of electron-lattice systems of reconstructed semiconductor surfaces studied by time-resolved photoemission (invited)2010

    • Author(s)
      谷村克己
    • Organizer
      第65回日本物理学会年次大会
    • Place of Presentation
      岡山
    • Year and Date
      2010-03-21
  • [Presentation] Ultrafast electron diffraction (invited)2010

    • Author(s)
      J.Yang
    • Organizer
      3^<rd> ILC Asian R&D Seminar under Core-University Program : Advanced Accelerator Workshop 2010
    • Place of Presentation
      Mumbai, India
    • Year and Date
      2010-03-09
  • [Presentation] Compact ultrafast diffractomator with MeV electrons generated by RF photocathode2010

    • Author(s)
      Y.Murooka, K.Naruse, J.Yang, M.Ishimaru, K.Tanimura
    • Organizer
      Banff Meeting on Structural Dynamics : Ultrafast Dynamics with X rays and Electrons
    • Place of Presentation
      Banff, Alberta, Canada
    • Year and Date
      2010-02-27
  • [Presentation] Applications of femtosecond electron beam : femtosecond pulse radiolysis and femtosecond electron diffraction (invited)2009

    • Author(s)
      J.Yang
    • Organizer
      The 1^<st> joint Asian accelerator workshop : accelerator techniques and their applications
    • Place of Presentation
      Beijing, China
    • Year and Date
      20091221-20091223
  • [Presentation] Computational Nano-materials Design for Semiconductors (invited)2009

    • Author(s)
      H.Katayama-Yoshida
    • Organizer
      Computational Materials Design Workshop
    • Place of Presentation
      Hanoi, Vietnam
    • Year and Date
      20091125-20091129
  • [Presentation] Irradiation-induced amorphous structures studied by electron diffraction radial distribution function analysis2009

    • Author(s)
      M.Ishimaru, M.Naito, A Hirata
    • Organizer
      Microscopy and Microanalysis 2009
    • Place of Presentation
      Richmond, Virginia, USA
    • Year and Date
      20090726-20090730
  • [Presentation] Competitions between coherence and incoherence appeared in momentum specified photoemission spectra (invited)2009

    • Author(s)
      K.Nasu
    • Organizer
      International Seminar in Shanghai Applied Physics Institute
    • Place of Presentation
      Shanghai, China
    • Year and Date
      2009-12-17
  • [Presentation] Photoexcitation of graphite creates a novel crystalline phase of sp3-bonded carbons (invited)2009

    • Author(s)
      Jun'ichi Kanasaki
    • Organizer
      International symposium on the Physics of Excitation-Assisted Nanoprocesses
    • Place of Presentation
      Wakayama, Japan
    • Year and Date
      2009-11-21
  • [Presentation] Ultrafast time-resolved electron diffraction (invited)2009

    • Author(s)
      Yoshie Murooka
    • Organizer
      International symposium on the Physics of Excitation-Assisted Nanoprocesses
    • Place of Presentation
      Wakayama, Japan
    • Year and Date
      2009-11-21
  • [Presentation] Theoretical study on the lattice dynamics of photo-induced nucleation (invited)2009

    • Author(s)
      K.Nasu
    • Organizer
      5th International Symposium on "Molecular Materials, Electronics, Photonics and Spintronics"
    • Place of Presentation
      Rennes, France
    • Year and Date
      2009-10-29
  • [Presentation] フェムト秒パルス電子線による表面ダイナミクス(招待講演)2009

    • Author(s)
      室岡義栄
    • Organizer
      第29回表面科学学術講演会
    • Place of Presentation
      東京
    • Year and Date
      2009-10-28
  • [Presentation] 半導体再構成表面における電子格子系の超高速動力学(招待講演)2009

    • Author(s)
      谷村克己
    • Organizer
      第29回表面科学学術講演会
    • Place of Presentation
      東京
    • Year and Date
      2009-10-27
  • [Presentation] Theoretical concepts and perspectives on photo-induced phase transitions (invited)2009

    • Author(s)
      K.Nasu
    • Organizer
      3rd International Advanced School on "Molecular Switching and Functional Materials"
    • Place of Presentation
      Rennes, France
    • Year and Date
      2009-10-27
  • [Presentation] Femtosecond time-resolved photoemission study on dynamcal relaxation of photo-injected valence holes on reconstructed Si surfaces2009

    • Author(s)
      T.Ichibayashi, K.Tanimura
    • Organizer
      11th International Conference on Electronic Spectroscopy and Structure
    • Place of Presentation
      Nara, Japan
    • Year and Date
      2009-10-10
  • [Presentation] Quasi-particle dynamics and electron-phonon coupling in graphine (invited)2009

    • Author(s)
      K.Nasu
    • Organizer
      2nd UVSOR Workshop on Low- Energy Photoemission of Solids using Synchrotron Radiation
    • Place of Presentation
      Okazaki, Japan
    • Year and Date
      2009-10-03
  • [Presentation] Femtosecond pulse radiolysis and femtosecond electron diffraction (invited)2009

    • Author(s)
      J.Yang
    • Organizer
      International Workshop on Ultrashort Electron & Photon Beams : Techniques & Applications
    • Place of Presentation
      Xi'an, China
    • Year and Date
      2009-09-09
  • [Presentation] Spontaneous formation of ultra-short-period lateral composition modulation in TlInGaAsN/TlInP structures2009

    • Author(s)
      M.Ishimaru, Y.Tanaka, S.Hasegawa, H.Asahi, K.Sato, T.J.Konno
    • Organizer
      2009 International Conference on Indium Phosphide and Related Materials
    • Place of Presentation
      Newport Beach, CA, USA
    • Year and Date
      2009-05-13
  • [Presentation] Ultrafast dynamics of pjhoto-injected surface-valence holes and laser-induced electronic bond rupture on Si(111)-(7x7)2009

    • Author(s)
      J.Kanasaki, T.Ichibayashi, K.Tanimura
    • Organizer
      The 12th International Workshop on Desorption Induced by Electronic Transitions
    • Place of Presentation
      Pine Mountain, GA, USA
    • Year and Date
      2009-04-20
  • [Presentation] Computational Nano-materials Design and Realization (invited)2009

    • Author(s)
      H.Katayama-Yoshida
    • Organizer
      Workshop on "ab initio calculation and materials Design"
    • Place of Presentation
      Golden, Colorado, USA
    • Year and Date
      2009-04-01
  • [Remarks]

    • URL

      http://www.sanken.osaka-u.ac.jp/labs/aem/Projects.html

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Published: 2011-06-16   Modified: 2016-04-21  

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