Abstract
Shubnikov de Haas, quantum Hall effect and direct measurements of the diagonal conductivity ▪ on InGaAs/InP heterostructures have been performed on a quasi Corbino disk combining Hall bar and Corbino geometry. The temperature dependence of ▪ is studied at several minima of the magnetoresistance ▪. A hopping conduction is observed when the Fermi level is between two Landau levels. And a low magnetic field intersubband scattering has been also noticed. The study of the ▪ transient time after illumination shows that the photoconductivity is mainly due to localized states.
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