Various types of metal-insulator transitions are discussed to find conditions for which an ideal surface of a bulk insulator is metallic. It is argued that for the correlation-driven Mott metal-insulator transition the surface phase diagram should be expected to have the same topology as the phase diagram for magnetic order at surfaces: The corresponding linearized mean-field descriptions, a si...

We report a voltage-controlled critical behavior observed in GaAs epitaxial structure containing dense array of ErAs nanoparticles. When fabricated with metal electrodes, the displays voltage- and temperature-dependent metal-to-insulator transition strong hysteresis current versus voltage temperature characteristics, temperatures as high 77 K. Furthermore, we diverging rms deviation electrical ...