Nonlinear skin effect in semimetals

The influence of nonlinearity on propagation of radio waves into semimetals in the geometry where the constant magnetic field $\mathbf{H}$ is directed along the trigonal axis of the crystal has been investigated. Strong magnetic Landau damping occurs in the linear mode in this geometry. It is shown that the electron capture by the magnetic field of a radio frequency wave of large amplitude decreases this absorption. As a result, the depth of the skin layer in the semimetal becomes the function of the amplitude of the exciting radio frequency field and can increase many times.