Coulomb-like mesoscopic fluctuations in a two-dimensional electron gas near filling factor ν=1 / 2

In the present work we report an experimental investigation of mesoscopic fluctuations in AlGaAs/GaAs microstructures in the vicinity of the Landau level filling factor ν=1/2. Mesoscopic fluctuations in this regime have been studied both in magnetoresistance and in resistance versus gate voltage dependencies. The ratio of the correlation magnetic field to the correlation electron density for all experimental curves investigated turns out to be close to 2Φ₀ which suggests the existence of a universal relation between the two types of mesoscopic fluctuations in the fractional quantum Hall regime.