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Four-terminal magnetoresistance of a two-dimensional electron-gas constriction in the ballistic regime

1988; American Physical Society; Volume: 37; Issue: 14 Linguagem: Inglês

10.1103/physrevb.37.8534

1095-3795

H. van Houten, C. W. J. Beenakker, P. H. M. van Loosdrecht, T. J. Thornton, H. Ahmed, M. Pepper, C. T. Foxon, J. J. Harris,

Advancements in Semiconductor Devices and Circuit Design

A novel negative magnetoresistance effect is found in four-terminal measurements of the voltage drop across a short constriction of variable width in a high-mobility two-dimensional electron gas. The effect is interpreted as the suppression by a magnetic field of the geometrical constriction resistance in the ballistic regime. Quantitative agreement with a simple model based on a Landauer-type formula is obtained.