Abstract
We study theoretically spin transport in a two-dimensional electron system with an essential spin-orbit interaction under topological phase transition due to changing a parallel magnetic field. Analytical formulas for the high-frequency magnetic susceptibility tensor under conditions when both spin bands are filled have been obtained. A numerical analysis giving full enough representation of the dependence of the spin magnetic susceptibility on the frequency and magnetic field is presented. It has been established that the magnetic susceptibility experiences a jump for magnetic field values at which the connectivity of the Fermi contour is changed.
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