研究・研究者
研究会・セミナー
| 演 題 | 「固体の真空状態を破壊する―固体の高次高調波発生の物理」 |
|---|---|
| 日 時 | 2023年02月10日(金) 16:00 |
| 講演者 | 田中耕一郎 教授（京都大学大学院理学研究科） |
| 場 所 | 分子科学研究所 研究棟201 |
| 概 要 | Recent development of femtosecond mid-infrared laser has been promoting nonlinear optics in solids to enter an extreme regime, where light-matter interaction energy (or Rabi frequency) becomes comparable with the scale of electronic transition energy. Higher-order harmonic generation (HHG) is a typical extreme nonlinear optics in solids, where electron-hole pairs are coherently generated in solids via tunneling process. The phenomenon is nothing but the breaking the electronic vacuum in solids via Schwinger mechanism. This has opened a new platform for investigating the ultrafast electron dynamics in the multi-terahertz region, because it clearly reflects the electron motion driven by the intense sub-cycle laser fields. In this talk, we will show HHG spectra in several low dimensional materials which have different conductive properties, including metals. In metals, a simple intraband current model reproduces the experimental data well. We also show a photo-doping and electro-doping effects on HHG. Common features and individual aspects will be discussed. |
| お問合せ先 | 倉持 光、瀬川泰知（2022年度コロキウム委員） |
