Coulomb Effects on the Magnetoconductance of a Two-Dimensional Electron   Gas in a Lateral Superlattice: A Screened Hartree-Fock Calculation
  We calculate the magnetoconductivity tensor of a 2D electron gas in a 1D periodic potential and quantising magnetic fields. We study the internal structure of the Shubnikov-de Haas peaks and analyse recent experimental results. The electron-electron interaction is accounted for within a screened Hartree-Fock approximation (HFA), which describes both compressible strips and an exchange-enhanced spin splitting, unlike the Hartree and the standard HFA. 
Andrei Manolescu (IFTM-Bucharest) and Rolf R. Gerhardts   (MPI-Stuttgart)