Generation-recombination noise due to localisation in spin-split Landau levels of a quantum Hall system

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Abstract
The existence of localised states in the tails of spin-split Landau levels was confirmed by noise spectroscopy performed on a two-dimensional electron gas in a GaAs/AlGaAs heterostructure. Noise was measured under integral quantum Hall conditions in the filling factor range 2< nu 1/2< nu 1/2 a third Lorentzian was found, which provides evidence for the existence of localised states between the two spin levels. The magnetic field dependence of the Lorentzian noise intensities indicate that the localised states are distributed asymmetrically over a spin level.