Electron−ripplon resonances in the Wigner-crystal conductivity of surface electrons in helium under inhomogeneous conditions

The structure of electron−ripplon conductivity resonances of a two-dimensional electron crystal at the free surface of liquid helium is studied theoretically under inhomogeneous conditions and in the presence of a constant magnetic field. Conditions are found for which different mechanisms of resonance anomalies in the energy loss rate are essential. The influence of the magnetic field on the low-frequency coupled states of the electron crystal is studied.

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