Study of dynamic spin systems using the terahertz-pump optical-probe spectroscopy

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13659
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic chemistry
• Research Institution: Kobe University
• Principal Investigator: KOHMOTO Toshiro 神戸大学, 理学研究科, 教授 (70192573)
• Research Collaborator: MORIYASU Takeshi 神戸大学, 理学研究科, 学術研究員
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 励起状態 / テラヘルツ

Outline of Final Research Achievements

We developed an optical-pump terahertz-probe spectroscopy system and a terahertz-pump optical-probe spectroscopy system using a terahertz pulse source and a nanosecond UV laser to study the excited spin dynamics under light irradiation. The propagation of the terahertz pulse was observed in photo-excited silicon. It was found that the observed peak-shift behavior of the transmitted terahertz pulse in high-density photo-excitation cannot be explained by the Drude model, and that the Drude-Smith model, in which carrier scattering is included, can explain the behavior qualitatively in both the low and high-density photo-excitation.

Free Research Field

レーザー分光学，磁気共鳴