Classical magnetotransport in a parabolic quantum well with a strong intersubband scattering

Classical magnetotransport coefficients were studied in a parabolic quantum well (PQW) structure with two subbands occupied which occupancies were det ermined using the Shubnikov-de Haas effect. Unexpectedly, a very low magnet oresistivity effect was observed in comparison with what was predicted from the classical point of view for a system with two kinds of carriers posses sing high mobilities around 10-20 m(2) V-1 s(-1). It was shown that methods , including the mobility spectrum technique, based on multilayer approach w ere inconsistent to describe the magnetotransport in a PQW system because o f a strong intersubband scattering. For analysis of the data, a theoretical approach was developed on the basis of solution of the Boltzmann kinetic e quation and corresponding formulae were derived employing clearly understoo d physical parameters of intra- and intersubband scattering frequencies. Ba sed on this theoretical approach the scattering frequencies were deduced fr om the experimental data. In the PQW the intersubband scattering was much s tronger than the intrasubband scattering and it determined the main feature s of the magnetotransport coefficients.