EXCHANGE-CORRELATION EFFECT OF ELECTRONS ON PAIR INTERACTION IN A LAYERED FERMI GAS

Taking into account electron exchange-correlation effects, a pairwise interaction potential is obtained in a layered lattice with two-dimens ional electron sheets. It exhibits an attraction between two like test charges for some electron (hole) densities and amazing behaviors with the change of the carrier density in a layer and along the direction normal to it. Also, the asymptotic expressions of the potential are pr esented. Its applications to a layered system, such as the Cu-O oxides , superlattices and graphite intercalation compounds may lead to a sig nificant understanding of some unusual behaviors of these materials.