Shubnikov-de Haas oscillations of the conductivity of a two-dimensional gas in quantum wells based on germanium and silicon. Determination of the effective mass and g factor

The Shubnikov-de Haas oscillations of the conductivity of a two-dimensional gas of holes in quantum wells consisting of pure germanium and silicon with low germanium content (13%) are analyzed to determine the effective masses and the g factor in these regions. The magnetic-field dependences of the resistivity rho(xx) obtained at temperatures from 33 mK to 4 K in magnetic fields up to I I T are used for the analysis. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3075945