Time-Resolved Surface Photoelectron Spectroscopy of Photoexcited Electron and Hole Dynamics on GaAs Using 92 eV Laser Harmonic Source

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概要

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• We have developed a time-resolved surface photoelectron spectroscopy system based on a 1.5 eV laser-pump and 92 eV high-order harmonic probe configuration that enables us to measure the electron and hole dynamics on a semiconductor surface. Core-level photoelectron spectra of GaAs(001) were successfully obtained with a single 59th harmonic, which was selected by using a pair of Mo/Si multilayer mirrors with a narrow reflection bandwidth. We observed transient energy shifts of the Ga 3d core level photoelectron peak of approximately 200 meV towards a higher binding energy, indicating that the surface potential changed due to the spatial separation of electron--hole pairs generated by the laser irradiation. The relatively slow recovery of the Ga 3d core level shift with a time constant of a few ns is dominated by the recombination process of the excess surface charges generated by the laser irradiation.

• 2012-07-25

著者

• Tateno Kouta

  Ntt Basic Research Laboratories Ntt Corporation

• Oguri Katsuya

  Ntt Basic Research Laboratories Nippon Telegraph And Telephone Corp.

• NISHIKAWA Tadashi

  NTT Basic Research Laboratories

• Gotoh Hideki

  Ntt Basic Research Laboratories

• Sogawa Tetsuomi

  Ntt Basic Research Laboratories

• Nakano Hidetoshi

  Ntt Basic Research Laboratories

• Nishikawa Tadashi

  NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Kanagawa 243-0198, Japan

• Kato Keiko

  NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Kanagawa 243-0198, Japan

• Tateno Kouta

  NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Kanagawa 243-0198, Japan

• Oguri Katsuya

  NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Kanagawa 243-0198, Japan

• Gotoh Hideki

  NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, Atsugi, Kanagawa 243-0198, Japan

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