title: Strong effect of resonant impurities on Landau-level quantization.
abstract: 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.
authors.affiliation: School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
authors.forename: G
authors.initials: G
authors.lastname: Allison
authors.forename: N
authors.initials: N
authors.lastname: Mori
authors.forename: A
authors.initials: A
authors.lastname: Patanè
authors.forename: J
authors.initials: J
authors.lastname: Endicott
authors.forename: L
authors.initials: L
authors.lastname: Eaves
authors.forename: D K
authors.initials: DK
authors.lastname: Maude
authors.forename: M
authors.initials: M
authors.lastname: Hopkinson