Metal-insulator transition in two dimensions

S. V. Kravchenko*

Physics Department, Northeastern University, Boston, MA 02115, U.S.A.

Recent experiments on a number of two-dimensional electron and hole systems suggest that there may exist a metal-insulator transition in two dimensions at zero magnetic field, contrary to conventional wisdom. External magnetic field, either parallel, tilted, or perpendicular to the 2D plane, suppresses the metallic temperature dependence of resistance and eliminates the metal-insulator transition. I will review the main experimental facts and suggested explanations of this unexpected phenomenon.

* In collaboration with D. Simonian, M. P. Sarachik, J. E. Furneaux, Whitney Mason, V. M. Pudalov, and T. M. Klapwijk