Density of States of Landau Levels from Activated Transport and Capacitance Experiments

  • D. Weiss
  • K. v. Klitzing
  • V. Mosser
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 67)

Abstract

In this publication we demonstrate that a combination of capacitance measurements with an analysis of thermally activated conductivity seems to be useful for the determination of the density of states (DOS) of Landau levels in two-dimensional systems. The experimental results indicate that no real energy gap exists, but that a nearly energy-independent background density of states (which decreases with increasing electron mobility) is present. Close to the center of the Landau levels the DOS can be described by a Gaussian lineshape with a line width which increases proportional to the square root of the magnetic field. This result agrees with the pre-diction within theself-consistent Born approximation, but the expected variation \( \Gamma \sim \sqrt {1/\mu } \) of the line width r with the mobility y of the electrons could not be confirmed.

Keywords

GaAs Haas 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1986

Authors and Affiliations

  • D. Weiss
    • 1
  • K. v. Klitzing
    • 1
  • V. Mosser
    • 2
  1. 1.MPI für FestkörperforschungStuttgartFed. Rep. of Germany
  2. 2.Physik-DepartmentTechnische Universität MünchenGarchingFed. Rep. of Germany

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