Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
1997-07-29
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
20 pages, revtex, 7 ps figures, to appear in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.56.9707
The magnetoresistivity tensor of an interacting two-dimensional electron system with a lateral and unidirectional electric or magnetic modulation, in a perpendicular quantizing magnetic field, is calculated within the Kubo formalism. The influence of the spin splitting of the Landau bands and of the density of states (DOS) on the internal structure of the Shubnikov-de Haas oscillations is analyzed. The Coulomb electron - electron interaction is responsible for strong screening and exchange effects and is taken into account in a screened Hartree-Fock approximation, in which the exchange contribution is calculated self-consistently with the DOS at the Fermi level. This approximation describes both the exchange enhancement of the spin splitting and the formation of compressible edge strips, unlike the simpler Hartree and Hartree-Fock approximations, which yield either the one or the other.
Gerhardts Rolf R.
Manolescu Andrei
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