EFFECTS OF COULOMB INTERACTION IN INTENTIONALLY DISORDERED SEMICONDUCTOR SUPERLATTICES

The interplay between disorder and electron-electron interaction is st udied using measurements of the vertical de conductivity of intentiona lly disordered GaAs/Al0.3Ga0.7As superlattices. At low temperatures a quasimetallic behavior is observed even for large disorder which is at tributed to an inhomogeneous charge distribution reducing the disorder potential. At low doping levels and low temperatures, exchange-correl ation interaction leads to an inhomogeneous charge distribution over t he wells of ordered superlattices similar to a one-dimensional Wigner lattice. (C) 1997 Academic Press Limited.