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VOLUME 54 (1991) | ISSUE 9 | PAGE 528
Electron solid at the Si surface in zero magnetic field?
We report observation of an electric field threshold conduction and saturation of voltage-current characteristics accompanying by ac voltage generation in low-density two-dimensional electron layer at the Si surface in zero magnetic field. The observed effects seem to be inconsistent with single-particle conduction and support the formation of a pinned quantum electron solid in zero magnetic field.