Self-assembled quantum dots as probes for Landau-level spectroscopy

摘要: Abstract We report on capacitance–voltage measurements of an inverted two-dimensional electron gas (2DEG) with a layer self-assembled InAs quantum dots in its immediate vicinity. A variable frequency approach enables us to determine the position Quantum dots-induced charging peaks for first six electrons per dot magnetic fields up 10 T . Using s-electron as energetic reference we monitor oscillations 2DEG Fermi energy function applied field. Because present experiment, also scale can be determined detailed comparison theoretical models becomes possible. find good agreement at low and intermediate fields, when Gaussian density states constant background is assumed. The discrepancy found highest investigated suggests that more sophisticated are necessary this regime.