Quantum Hall effect of two-dimensional electron gas in AlyGa1−yAs/Ga1−xInxAs/GaAs pseudomorphic structures

The quantum Hall effect of electrons in AlGaAs/Ga1−x Inx As/GaAs pseudomorphic strained heterostructures is reported for the first time. Despite the large strain induced by the lattice mismatch, clear quantum Hall plateaus and Shubnikov–de Haas oscillation are observed, indicating the presence of a well behaved two-dimensional electron gas. Although the mobility of the sample is fairly low, a pronounced asymmetry in the spin splitting of the magnetoresistivity appears at high magnetic fields in contrast to the previous results on AlGaAs/GaAs structures where asymmetry appears only in the high-mobility samples and disappears when the mobility is lower. This indicates that the shape of the state density is not influenced significantly by the presence of the high concentration of the short-range cluster-scattering centers.