INTERACTION FOOTPRINTS IN 2-DIMENSIONAL DISORDERED ELECTRONIC SYSTEMS

The effect of electron-electron interaction on the properties of a two -dimensional disordered electronic system are studied, guided by the q uest for a cojectured existence of a possibly interaction induced meta l-insulator transition (MIT). Numerical simulations performed on small systems indicate that the long-range Coulomb electron-electron intera ction leads to a significant enhancement of the persistent current. At the same time, the effect of electron-electron interaction on the con ductance is rather small so that, strictly speaking, there is no inter action-induced MIT in two-dimensional electronic systems. Finally, the statistics of energy levels for strongly correlated disordered system s is discussed, and the variation in statistics as a function of the e lectron-electron interaction is traced.