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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...
We present results of an experimental study concentrated on performance optimization of highly sensitive Pb $_{1-x}$Sn$_x$Te(In) terahertz photodetectors perspective for applications in the terahertz astronomy. The optimization was reached trough variation of the regime of persistent photoconductivity quenching by radio-frequency pulses. It is demonstrated that the quenching effectiveness rises rapidly...
We report on first results obtained with the use of a new setup for direct passive measurements of the low temperature terahertz emissivity of different materials — metals, superconductors, and others. The setup allows estimating the level of noise originating from the thermal radiation of mirrors in terahertz space missions. This setup also makes it possible to develop the passive terahertz emissivity...
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