Coulomb Effects on the Magnetoconductance of a Two-Dimensional Electron Gas in a Lateral Superlattice: A Screened Hartree-Fock Calculation

摘要

We calculate the magnetoconductivity tensor of a 2D electron gas in a 1Dperiodic potential and quantising magnetic fields. We study the internalstructure of the Shubnikov-de Haas peaks and analyse recent experimentalresults. The electron-electron interaction is accounted for within a screenedHartree-Fock approximation (HFA), which describes both compressible strips andan exchange-enhanced spin splitting, unlike the Hartree and the standard HFA.