Unveiling the ultrafast optoelectronic properties of 3D Dirac semi-metal Cd3As2

摘要

We employ ultrafast optical-pump terahertz-probe spectroscopy and ultrafast THz emission spectroscopy to investigate the ultrafast charge carrier dynamics in the 3D Dirac semi-metal Cd3As2. We extract the temperature-dependent electron mobility (16,000cm^{2V−1s−1 at 5K) for Cd3As2 nanowire ensemble. We also demonstrate strong THz emission from both Cd3As2 single crystal and nanowires, whose polarity depends strongly on incident angle and pump polarisation.}