10:15 〜 10:45
▲ [10a-Z23-5] [INVITED]High Harmonic Generation in Metals and Doped Semiconductors
キーワード：high harmonic generation, infrared light, ultrafast
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. 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.