A Wigner crystal on helium shows nonlinear velocity saturation at 150 MHz, explained by Bragg-Cherenkov coupling to higher-order ripplon overtones.
Spec- troscopy of Wigner crystal polarons in an atomically thin semiconductor,
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High-frequency nonlinear conductivity of a Wigner crystal
A Wigner crystal on helium shows nonlinear velocity saturation at 150 MHz, explained by Bragg-Cherenkov coupling to higher-order ripplon overtones.