Terahertz Characterization of Charge Carrier Dynamics in 3D Dirac Semi-metal Cd3As2 Nanowires

Optical Pump Terahertz Probe (OPTP) spectroscopy is a well-established measurement technique with which charge-carrier dynamics of semiconductor nanowires (NW) can be extracted in a noncontact manner. Here in this work, we employ OPTP spectroscopy for measuring temperature-dependent photoconductivity spectra of 3D Dirac Cd
3
As
2
semi-metal nanowires, revealing a high Extrinsic carrier concentration of $\sim 2.0 x 10^{17} \mathrm{cm}^{-3}$ and ultrahigh carrier mobility of up to $\sim 13 x 10^{3} \mathrm{cm}^{2}\mathrm{V}^{-1}\mathrm{s}^{-1}$ at a temperature of 5 K.