Mathematical model of spin photocurrent excitation in of antiferromagnetic isolators nanostructures
Abstract
Fundamental principles of circular photogalvanic effect as a result of circularly polarized light probing of metal environment and generation of a direct photocurrent which direction depends on the polarization of light are considered. The peculiarities of the occurrence of the mentioned effect in the structures of antiferromagnetic dielectrics are determined, nonlinearity of the effect is indicated, and further use in opto-spintronics’ data storage and nanodetectors of the electromagnetic field is proposed. Due to necessity of the mathematical apparatus development, the consideration of the spin pulse was transferred from photons to magnons. Thus, it was stated that the circularly polarized electromagnetic field within the model generates a direct magnon spin photocurrent and the direction of the current is determined by the helicity of light. It is shown that the phenomenon of resonance based on general principles of nanophotonics can be represented as the interaction of the second order polarized light-matter interaction. The mathematical model was further adopted in order to take into account the contribution of the geometric organization of antiferromagnetic isolator complex lattice structures and the phenomenon of antisymmetric exchange.
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