Study of ultrafast dynamics in graphene by using high-order haromonic photoelectron spectroscopy

2013 Fiscal Year Final Research Report

• Project/Area Number: 23310086
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Nanomaterials/Nanobioscience
• Research Institution: NTT Basic Research Laboratories
• Principal Investigator: OGURI Katsuya 日本電信電話株式会社ＮＴＴ物性科学基礎研究所, 量子光物性研究部, 主任研究員 (10374068)
• Co-Investigator(Kenkyū-buntansha): NAKANO Hidetoshi 東洋大学, 理工学部, 教授 (90393793) ; HIBINO Hiroki 日本電信電話株式会社NTT 物性科学基礎研究所, 機能物質科学研究部, 部長 (60393740) ; KATO Keiko 日本電信電話株式会社NTT 物性科学基礎研究所, 量子光物性研究部, 研究主任 (40455267) ; SEKINE Yoshiaki 日本電信電話株式会社NTT 物性科学基礎研究所, 機能物質科学研究部, 研究主任 (70393783)
• Project Period (FY): 2011-04-01 – 2014-03-31
• Keywords: グラフェン / 超高速ダイナミクス / 時間分解光電子分光 / 表面増強ラマン散乱 / 電子位相緩和 / 高次高調波

Research Abstract

To clarify ultrafast relaxation dynamics in high quality and large-area graphene which is grown on a silicon carbide substarate by sublimating silicon, we have developed femtosecond time-resolved surface photoelectron spectroscopy based on a high-order harmonics source. By using this system, we clarified the surfce transport of photoexcited electron and hole on a semiconductor surface, thus showing the potential of this system for measuring ultrafast relaxation dynamics in graphene. We have also studied the surface-enhanced Raman scattering (SERS)of graphene grown on SiC by depositing Ag. The enhancement of the Raman spectrum in graphene reached more than 60. Moreover, we have successfully estimated a electron dephasing time of monolayer graphene to be approxiamtely 50 fs by using a time-resolved transient diffraction technique.

Research Products

• [Journal Article] High-Order Harmonic Photoelectron Spectroscopy System Towards Measuring Attosecond Electron Dynamics on Solid Surfaces (2013)
  • Author(s): K. Oguri, H. Nakano, K. Kato, T. Nishikawa, A. Ishizawa, H. Gotoh, K. Tateno, and T. Sogawa
  • Journal Title: Multiphoton Processes and Attosecond Physics, Springer Proceedings in Physics Volume: Vol.125 Pages: 373-378
  • DOI: 10.1007/978-3-642-28948-4_62
• [Journal Article] Time-Resolved Surface Photoelectron Spectroscopy of Photoexcited Electron and Hole Dynamics on GaAs Using 92 eV Laser Harmonic Source (2012)
  • Author(s): K. Oguri, K. Kato, T. Nishikawa, H. Gotoh, K. Tateno, Te. Sogawa and H. Nakano
  • Journal Title: Japanese Journal Applied Physics Volume: Vol.51 Pages: 072401
  • DOI: 10.1143/JJAP.r51.072401
  • Peer Reviewed
• [Presentation] Ultrafast Spectroscopy Based on High-Order Harmonic Sources for Sub-Cycle Dynamics in Solids (2014)
  • Author(s): K. Oguri, H. Mashiko, K. Kato, T. Sogawa, and H. Gotoh
  • Organizer: The 5th Shanghai-Tokyo Advanced ResearchSymposium on Ultrafast Intense LaserScience (STAR5)
  • Place of Presentation: Miyazaki, Japan
  • Year and Date: 2014-05-23
  • Invited
• [Presentation] Ultrafast diagnostics of photo-excited processes in solid using femtosecondlaser-based soft x-ray (2012)
  • Author(s): K. Oguri, H. Nakano, Y. Okano, T. Nishikawa, K.Kato, A. Ishizawa, T. Tsunoi, H. Gotoh, K. Tateno, and T. Sogawa
  • Organizer: 8th International Conference on Photo-Excited Processes and Applications (ICPEPA-8)
  • Place of Presentation: Rochester, USA. pulse sources
  • Year and Date: 2012-08-17
  • Invited
• [Presentation] Surface Carrier dynamics onSemiconductor Studied with Femtosecond Core-Level Photoelectron Spectroscopy Using Extreme Ultraviolet High-OrderHarmonic Source (2012)
  • Author(s): K. Oguri, T. Tsunoi, K. Kato, H. Nakano, T. Nishikawa, H. Gotoh, K. Tateno, and T. Sogawa
  • Organizer: XVIIIth International Conference on Ultrafast Phenomena (UP2012)
  • Place of Presentation: Lausanne Switzerland
  • Year and Date: 2012-07-10