Electron energy relaxation in (Cd₁-xZnx)₃As₂ Dirac semimetals studied by terahertz laser pulses

Abstract

We performed a study of a range of (Cd₁-xZnx)₃As₂ mixed crystals undergoing a transition from the Dirac semimetal phase to trivial semiconductor at variation of the composition x. We show that for the Dirac semimetal phase, the photoelectromagnetic effect amplitude is defined by the number of incident radiation quanta, whereas for the trivial semiconductor phase, it depends on the power in a laser pulse irrespective of its wavelength