XXIX Symposium "Nanophysics and Nanoelectronics", Nizhny Novgorod, March 10-14, 2025

Microwave photoconductivity in Pb$_{1-x}$Sn$_x$Te(In) semi-insulating solid solutions

S. N. Chmyr'^a, A. V. Galeeva^a, D. E. Dolzhenko^a, A. V. Nikorich^b, D. R. Khokhlov<sup>ac

a</sup> Lomonosov Moscow State University, Faculty of Physics
^b Institute of Applied Physics Academy of Sciences of Moldova, Kishinev
^c P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow

Abstract: We study photoconductivity in Pb$_{1-x}$Sn$_x$Te(In) semi-insulating solid solutions under 48 GHz radiation at temperatures 4.2–50 K. We found qualitative differences between the microwave photoconductivity and previously observed photoconductivity in- duced by terahertz radiation with frequencies $f\ge$ 0.6 THz. We show that in contrast to the terahertz photoconductivity the microwave photoconductivity at low temperatures has negative sign and does not manifest long-term relaxation. Possible mechanisms responsible for the microwave photoresponse are discussed.

Received: 17.05.2025
Revised: 16.06.2025
Accepted: 23.06.2025

DOI: 10.61011/FTP.2025.02.60983.8183