Electron Localization in a Two-Dimensional System in Strong Magnetic Fields. III. Impurity-Concentration Dependence and Level-Mixing Effects

摘要: A computer simulation is performed to study localization in a two-dimensional electron system strong magnetic fields. When scatterers only with attractive potentials are present and their concentration not so high, the density of states symmetric around center each Landau level. The energy delocalized this case shown be close where real part Green's function vanishes except extremely low concentrations scatterers. Effects mixings between different levels also studied by including finite number levels. It that extended remain even if level important for shifted higher side decrease strength field.