Wigner Crystallization of Two Dimensional Electrons Formed on the Surface of Solid Neon

Conductivity of two dimensional electrons trapped on the surface of solid neon has been measured with the electron density up to 3×10 10 /cm 2 . From the anomaly in the temperature dependence of the conductivity we have determined the critical temperature where electrons undergo a transition to a Wigner crystal, and extended the phase diagram of the crystal to a density one order of magnitude higher than that obtained for electrons on liquid helium surface. The transition was found to be characterized by a relation \({=}138± 25\). No quantum effect was observed in this density region.