Dynamic Terahertz Response in the Dirac Semimetal Cd_3As_2 Induced by Ultrafast Optical Excitation

摘要

Hot electron relaxation and coupling in Cd_3As_2 is studied by employing ultrafast time-domain THz spectroscopy. The excited carriers enhance the absorption of THz and relax in ps-time scales, the cooling rules consistent with mid-IR spectroscopy.