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      Ballistic transport through a quantum point contact: elastic scattering by impurities

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      Author
      Tekman, E.
      Çıracı, Salim
      Date
      1990
      Source Title
      Physical Review B
      Print ISSN
      2469-9950
      Publisher
      American Physical Society
      Volume
      42
      Issue
      14
      Pages
      9098 - 9103
      Language
      English
      Type
      Article
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      Abstract
      The effects of elastic scattering due to impurities in a quasi-one-dimensional constriction are investigated with an exact calculation of the conductance. It is found that the quantization of conductance is distorted owing to scattering by a single impurity which exists in an infinite constriction. The extent of deviation from quantized values depends on the strength, position, and lateral range of the scattering potential. The resonance structure due to interference of current-carrying waves is still apparent for a constriction of finite length containing an impurity. However, both the magnitude and position of these oscillations in the resonance structure are affected as a result of elastic scattering. A resonant tunneling effect is found due to a state bound to the attractive impurity potential. © 1990 The American Physical Society.
      Permalink
      http://hdl.handle.net/11693/26214
      Published Version (Please cite this version)
      http://dx.doi.org/10.1103/PhysRevB.42.9098
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