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Two-dimensional motion of charge carriers in ultrathin films

Authors
Journal
Journal of Physics and Chemistry of Solids
0022-3697
Publisher
Elsevier
Publication Date
Volume
49
Issue
10
Identifiers
DOI: 10.1016/0022-3697(88)90175-8
Keywords
  • Extreme Quantum Size Effect
  • Two-Dimensional Motions
Disciplines
  • Physics

Abstract

Abstract Extreme size quantizations are defined in thin films of metals, semimetals and semiconductors. Applying the vanishing gradient boundary condition to quantum size effect, the motion of electrons or holes would have become statistically two-dimensional once the film thickness had been sufficiently reduced to the range to be called ultrathin. Thermodynamic and transport characters of charge carriers in ultrathin films are discussed. It is also shown that the electrical resistivity in ultrathin semimetallic and semiconducting films decreases with decreasing film thickness, a fact that has been experimentally observed in the semimetal bismuth.

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