Absence of localization in certain field-effect transistors

We review some experimental and theoretical results on the metal-to-insulator transition (MIT) observed at zero magnetic field (B = 0) in several two-dimensional electron systems (2DES). Scaling of the conductance and magnetic-field dependence of the conductance provide convincing evidence that the MIT is driven by Coulomb interactions among the carriers and is dramatically sensitive to spin polarization of the carriers. © 1998 Academic Press Limited.