[Tu-P1-E] Terahertz spectroscopy and control of novel material systems

2:45 PM - 3:00 PM JST(5:45 AM - 6:00 AM UTC)

[Tu-P1-E-03] Ultrafast optical control of long-lived valley polarization in germanium studied by time-resolved terahertz polarimetry

〇Ami Mi Shirai¹, Yuta Murotani¹, Tomohiro Fujimoto¹, Kota Aikyo¹, Changsu Kim¹, Hidefumi Akiyama¹, Jun Yoshinobu¹, Ryusuke Matsunaga¹ (1. The Institute for Solid State Physics, The University of Tokyo (Japan))

Using time- and polarization-resolved terahertz spectroscopy, we observed a light-induced valley polarization dynamics in Ge. The experiment shows the long-lived valley polarization with a large signal amplitude and controllability by mid-infrared pulses, suggesting the potential for practical valleytronics applications.