Research

Keywords

• Nonlinear Optical Phenomena
• Raman Scattering
• Femtosecond Pump-Probe Spectroscopy
• Terahertz Time-Domain Spectroscopy

Subject

• Research of hydrogen-bonding liquid by terahertz time-domain spectroscopy
• Research of electron lattice interaction by coherent phonon
• Research of carrier dynamics in semiconductor

Outline

We investigate the properties of materials using laser light as a probe. Recently, we are particularly interested in semiconductor nanoparticles of a few nanometer size. Semiconductor nanoparticles are the subject of the 2023 Nobel Prize in Chemistry and can produce large quantum mechanical effects by confining electrons in extremely small semiconductors. These quantum effects are expected to lead to applications such as quantum computing and quantum communication.

We are currently studying the energy dynamics inside nanoparticles and the fine energy structure of excited states by measuring the time-resolved luminescence, and we also deliberately create electron-rich states inside the nanoparticle to study the interactions between electrons in strongly confined situation.

Recent Highlights

1. “Optical properties of ZnO nanocrystals under photo-induced electron doping” Sekika Yamamoto and Tenta Ushida,
   J. Appl. Phys. 136, 064302 (2024).(DOI: 10.1063/5.0219897)
2. “Size dependence of luminescence decay process in CsPbBr3 nanocrystals”
   Yura Suzuki and Sekika Yamamoto,
   J. Appl. Phys. 135, 083107 (2024).(DOI: 10.1063/5.0190753)

Laboratory Website

Staff

• 
  YAMAMOTO Sekika

  Assistant Professor

  Emailsekika(at)phys.sci.hokudai.ac.jp

  Office5-01-22

Contact

ZIP Code　060-0810

Address　Kita 10, Nisi 8, Kita-ku, Sapporo 060-0810, JAPAN

TEL　+81(JPN)-11-706-3551