Influence of shortwave surface excitations of liquid helium on damping effects in a two-dimensional electron gas

It is shown that two-ripplon radiation processes of shortwave excitation can turn out to be the fundamental energy relaxation mechanism of surface electrons in helium under different nonequilibrium conditions. The contribution of these processes to the excited Landau level width and the momentum and energy collision frequency of a two-dimensional electron gas is calculated. It is also shown that in the presence of a roton section in the spectrum of the surface excitations, the width of excited Landau levels is a non monotonic function of the magnetic field intensity H and has a singularity at certain values of H. The possibility of using the results obtained to investigate the surface excitation spectrum of liquid helium is studied.

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