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We report on the observation of magneto-oscillations of terahertz radiationinduced photocurrent in HgTe/HgCdTe quantum wells (QWs) of different widths,which are characterized by a Dirac-like, inverted and normal parabolic bandstructure. The photocurrent data are accompanied by measurements ofphotoresistance (photoconductivity), radiation transmission, as well asmagneto-transport. We develop a microscopic model of a cyclotron-resonanceassisted photogalvanic effect, which describes main experimental findings. Wedemonstrate that the quantum oscillations of the photocurrent are caused by thecrossing of Fermi level by Landau levels resulting in the oscillations of spinpolarization and electron mobilities in spin subbands. Theory explains aphotocurrent direction reversal with the variation of magnetic field observedin experiment. We describe the photoconductivity oscillations related with thethermal suppression of the Shubnikov-de Haas effect.

Quantum Oscillations of Photocurrents in HgTe Quantum Wells with Dirac and Parabolic Dispersions