Nonlocal quantum conduction and the influence of contact resistance in GaAs/AlGaAs wires

S. Takaoka, K. Tsukagoshi, K. Oto, T. Sawasaki, K. Murase, Y. Takagaki, K. Gamo, S. Namba

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The Shubnikov-de Haas (SdH) effects of multi-terminal GaAs/AlGaAs wires in the nonlocal geometry, where the nominal current path is spatially separated from and does not intersect with the voltage probes, have been measured in the wide range of the seperation length (0.4 μm < ΔL < 1.5 mm) between the current and voltage probes, which will be related to the quantum effect in connection with the edge currents. Further, it is found that the signal of nonlocal SdH resistance becomes even negative, when the contact resistance is very large. This will be explained by the non-equal chemical potentials among the edge currents and the different transmission probabilities of the edge current to the probe due to the selective contact resistance for each edge state.

Original languageEnglish
Pages (from-to)282-285
Number of pages4
JournalSurface Science
Volume267
Issue number1-3
DOIs
Publication statusPublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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