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

doi:10.1016/0039-6028(92)91138-2

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 journal › Article

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 language	English
Pages (from-to)	282-285
Number of pages	4
Journal	Surface Science
Volume	267
Issue number	1-3
DOIs	https://doi.org/10.1016/0039-6028(92)91138-2
Publication status	Published - 1992
Externally published	Yes

ASJC Scopus subject areas

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

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10.1016/0039-6028(92)91138-2

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title = "Nonlocal quantum conduction and the influence of contact resistance in GaAs/AlGaAs wires",

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.",

author = "S. Takaoka and K. Tsukagoshi and K. Oto and T. Sawasaki and K. Murase and Y. Takagaki and K. Gamo and S. Namba",

year = "1992",

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language = "English",

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journal = "Surface Science",

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T1 - Nonlocal quantum conduction and the influence of contact resistance in GaAs/AlGaAs wires

AU - Takaoka, S.

AU - Tsukagoshi, K.

AU - Oto, K.

AU - Sawasaki, T.

AU - Murase, K.

AU - Takagaki, Y.

AU - Gamo, K.

AU - Namba, S.

PY - 1992

Y1 - 1992

N2 - 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.

AB - 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.

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