Abstract
The Shubnikov-de Haas (SdH) oscillations of multiterminal GaAs/AlGaAs wires have been observed in the nonlocal geometry with very long separation length (0.5mm<ΔL<1.5mm) between the current and voltage probes. The nonlocal effect seems to be related to the macroscopic quantum effect in connection with the bulk and edge currents, where energy relaxation length of edge currents is very long. 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 nonequilibrium among chemical potentials of edge currents and by different transmission probabilities of edge currents to the probe due to the selective contact resistance for each edge state.
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