A bilayer electron system that is formed in a 60-nm-wide GaAs quantum well and has large difference of the densities layers been studied. It found that, when magnetic field tilted from normal to plane system, integer Hall effect states at filling factors Landau levels 1 2 disappear; instead, fractional interval between these appear ν F = 4/3, 10/7, 6/5 with odd denominators factor 5/4. Several ...
