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Effect of Additional Irradiation Induced Scattering Centres on the Quantum Hall Plateau Widths in GaAs-AlxGa1−xAs Heterostructures

  • W. Möhle
  • H. Adrian
  • L. Bliek
  • G. Weimann
  • W. Schlapp
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 87)

Abstract

The presence of random scattering centres in a two-dimensional electron gas (2DEG) is essential for the occurrence and the widths of the quantum Hall effect (QHE) plateaus within the localization model [1]. Scaling theory indicates that within a infinite two-dimensional system all states are localized by quantum coherence effects for any degree of disorder [2]. Concerning the QHE the localization model describes the effect of disorder on the localization of Landau states. Within this model the QHE plateau width should be proportional to the number of electrons in localized states above the upper mobility edge of the highest filled Landau band plus those below the lower mobility edge in the next higher band in energy. In a recent paper we studied the effect of low temperature proton irradiation on the resistivity ρ, mobility µ, carrier concentration n and QHE structures of GaAs-A1xGa1−xAs heterostructures [3]. As a continuation of this work we present a systematic investigation of these quantities on irradiation induced disorder with additional emphasis on the comparison of different samples. To this purpose GaAs-AlxGa1−xAs heterostructures were successively irradiated with 6 MeV protons and the longitudinal and transversal resistivities ρ xx and ρ xy were measured in magnetic fields after each dose.

Keywords

Localization Model Reservoir Model Irradiation Experiment Quantum Hall Effect Mobility Edge 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin, Heidelberg 1989

Authors and Affiliations

  • W. Möhle
    • 1
  • H. Adrian
    • 1
  • L. Bliek
    • 2
  • G. Weimann
    • 3
  • W. Schlapp
    • 3
  1. 1.Physikalisches InstitutFriedrich-Alexander-UniversitätErlangenFed. Rep. of Germany
  2. 2.Physikalisch-Technische BundesanstaltBraunschweigFed. Rep. of Germany
  3. 3.FTZDeutsche BundespostDarmstadtFed. Rep. of Germany

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