Abstract
The effective mass in the two-dimensional electron gas of a delta-doped InxGa1−xAs HEMT structure from the variation of the amplitude of the Shubnikov–de Haas oscillations was determined; with the temperature from measurements obtained as a function of the magnetic field and the gate voltage. The effective mass shows at intermediate magnetic fields an oscillatory behaviour, periodic with the filling factor and with maximum amplitude for even factors. Its relation to the oscillatory behaviour of the cyclotron effective mass and the effective g factor is discussed. The effective mass increases with the electron density and the inversion of the magnetic field.
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