ausblenden:
Schlagwörter:
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Zusammenfassung:
We investigate experimentally the effect of a random distribution of
nitrogen (N) impurities on the Landau-level spectrum of a GaAs quantum
well. Our magnetotunneling study reveals complex and nonequally spaced
Landau levels and a quenching of the Landau states at a well-defined
bias and electron energy which is resonant with that of the N atoms.
Analysis of the magnetic field dependence of the tunnel current into
the Landau levels of the well also provides quantitative information
about the nonresonant component of the N-related scattering potential.
