Parametric excitation of collective modes in an electron layer on a liquid surface

Parametric excitations of electrostatic oscillations in a two-dimensional electron gas on a liquid surface and a surface wave (ripplon) of the liquid are studied. The excitations are achieved by an oscillating (pump) electric field along the liquid surface at a frequency near the characteristic frequency of the two-dimensional electron gas. The threshold value of the pump field depends, among other parameters, on the damping rate of the oscillation mode of the electrons. If the damping is controlled by the electron to atomic helium scattering, then the threshold value for the pump electric field can become as low as 100 mV/cm.

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