Magnetoconductivity of a Mercury Cadmium Telluride Resonant THz Detector

M. Bąka, b, D. Yavorskiya, K. Karpierza, J. Łusakowskia, D. Butb, J. Przybytekb, I. Yahniukb, G. Cywińskib, W. Knapb, c, F. Teppec, S. Krishtopenkoc, N.N. Mikhailovd, S.A. Dvoretskyd, V.I. Gavrilenkoe aFaculty of Physics, University of Warsaw, L. Pasteura 5, 02-093 Warsaw, Poland bInstitute of High Pressure Physics, PAS, Sokołowska 29/37, 01-142 Warsaw, Poland cLaboratoire Charles Coulomb, UMR CNRS 5221, 34095 Montpellier, France dA.V. Rzhanov Institute of Semiconductor Physics, Siberian Branchm RAS, Novosibirsk 630090, Russia eInstitute for Physics of Microstructures, RAS, GSP-105, 603950, N. Novgorod, Russia

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Magnetoconductivity tensor σ̂. of a THz detector made of a Hg1-xCdxTe epitaxial layer was determined at a few temperatures T between 2 K and 100 K for magnetic fields B up to 0.5 T. At all temperatures the sample exhibited n-type conductivity. The observed dependence of σ̂.(B) could be reasonably approximated with a one-carrier model at the highest T, but this model cannot be used to describe data at the lowest temperatures. We show that optical transitions at THz frequencies occur at magnetic fields characterized by strong changes of conductivity. That is why response of the detector working in a photoconductive mode must be corrected by taking into account its σ̂.(B) dependence.

DOI:10.12693/APhysPolA.134.973 topics: magnetoconductivity, THz spectroscopy, mercury cadium telluride