Observation of Two-Dimensional Plasmons and Electron-Ripplon Scattering in a Sheet of Electrons on Liquid Helium

The two-dimensional plasmon dispersion relation ${{\ensuremath{\omega}}_{p}}^{2}=2\ensuremath{\pi}N{e}^{2}\frac{k}{m}$ has been verified in the classical one-component plasma formed by a sheet of electrons in image-potential-induced surface states on liquid helium. For temperatures below 0.68 K the plasmon damping indicates that the electron mobility is limited by electron-ripplon scattering.

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