QUANTUM HALL-EFFECT IN MULTILAYER P-GE/GE1-XSIX HETEROSTRUCTURES AND ENERGY-SPECTRUM OF THE 2D HOLE GAS IN A MAGNETIC-FIELD

The quantum Hall effect and the structure of magnetoresistance oscillations observed in multilayer p-Ge/Ge1-xSix heterostructure systems are analyzed on the basis of a picture of magnetic levels of the Ge valence band calculated from the model of an infinitely deep square quantum well. The odd numbers of the plateaus in the quantum Hall effect in weak magnetic fields and several features of the magnetoresistance oscillations are explained in terms of an involvement of a second subband of a spatial quantization of heavy holes in samples with relatively wide conducting layers and also in terms of a crossing of subband levels