Advertisement

Disordered and Other Nonperiodic Solids

  • Eleftherios N. EconomouEmail author
Chapter
  • 3.2k Downloads
Part of the Graduate Texts in Physics book series (GTP)

Summary

Various types of disordered materials are mentioned and their main structural and other properties are briefly reviewed. The multiple scattering (in the presence of strong disorder) and the wave interference reduce the diffusion coefficient and tend to localize the electrons. The dimensionality is an important factor, in the sense that for D < 2 any amount of disorder is enough to localize all the states, while for D > 2 a critical amount of disorder (depending on the energy) is needed for localization. The critical dimensionality, D = 2, in the absence of magnetic field belongs to the D < 2 category, while in the presence of magnetic field belongs to the D > 2 category, including the possibility of frictionless flow (the Quantum Hall phase). In general, the magnetic field tends to undo the effects of interference. In quasi-one-dimensional systems, the conductance, G, between contacts p and q is related to the transmission coefficient, \( \overline T \)pq, through the relation, \( G_{pq} \, = \,2(e^2 /h)\overline T _{pq} \). The coherent potential approximation is a powerful method for obtaining averages by introducing a periodic effective medium determined self-consistently.

Keywords

Landau Level Edge State Localization Length Amorphous Semiconductor Coherent Potential Approximation 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Further Reading

  1. A general presentation of the subject of disordered materials is given in the book by Mott and Davis [DS133], although the elder editions do not contain more recent developments.Google Scholar
  2. The theory of disordered media, and in particular, their transport properties are presented in many books. Among them I mention the books by Datta [DS135], Imry [DS137], Lifshitz et al. [DS134], and by Economou [DSL153], Chaps. 6–9.Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Foundation for Research and Technology-Hellas (FORTH) Department of PhysicsUniversity of CreteHeraklionGreece

Personalised recommendations