DYNAMICS OF THE SLIDING TRANSITION IN THE WIGNER SOLID ON LIQUID-HE-4

We report an observation of a dynamical transition in the Wigner solid on liquid He-4. The AC conductivity sigma(xx) jumps abruptly at a cer tain input voltage. The threshold input voltage V-th for the sigma(xx) jump varies as V(th)proportional to B--0.8 f(-1)n(s)(1.5) E perpendic ular to, where B, f, n(s), and E perpendicular to are magnetic field, frequency, electron density and pressing electric field, respectively. We interpret the sigma(xx) jump as the collective sliding of the elec trons out of the periodic deformation of the He surface.