Journal of Vacuum Science & Technology B Microelectronics Processing and Phenomena · 1983 · 76 citations · 0 references
Natural SciencesPhysicsCondensed Matter PhysicsElectromagnetismSemiconductor MaterialsElectronic Band StructureElectronic EffectsMagnetic Properties Of SolidsMagnetism In SolidsTwo-dimensional SemiconductorsElectronic Density Of StatesMagnetic Field InhomogeneityMagnetism In Two-dimensional SemiconductorsSquid MagnetometersTwo-dimensional Electron GasesTwo-dimensional Electron Systems
We report the first observation of the oscillatory magnetic moment as a function of the magnetic field (deHaas–van Alphen effect) of a two-dimensional electron gas. The measurements were performed at 1.5 K on a modulation-doped GaAs–(AlGa)As heterostructure using a SQUID magnetometer. The strength of the signal was enhanced by stacking 4000 layers equivalent to an area of 240 cm2. The data are in qualitative agreement with theory but the amplitude of the oscillations is about a factor of 30 weaker than expected. We attribute this discrepancy to sample inhomogeneities. More accurate measurements should allow a direct determination of the electronic density of states.