Abstract
Photon drag current caused by transfer of momentum from absorbed far-infrared radiation to two-dimensional (2D) electrons is calculated for spin-flip transitions in nonsymmetric heterostructures. The induced current is not parallel to the longitudinal component of photon wave vector $\mathbf{q}$ because the contribution $[\mathbf{q}\ifmmode\times\else\texttimes\fi{}{\mathbf{v}}_{s}]$ $({\mathbf{v}}_{s}$ is the characteristic spin velocity along the normal to 2D layer) is essential in the matrix element for spin-flip electron-photon interaction. Both spectral and angular dependencies of the current and the effect of the in-plane magnetic field are discussed for the short-range scattering case. Numerical estimations for typical parameters of InAs-based heterostructures and a THz pump with intensity $1 {\mathrm{k}\mathrm{W}/\mathrm{c}\mathrm{m}}^{2}$ are presented.
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