Spin-Dependent Nonlocal Quantum Transport Influenced by Gate Voltage in GaAs/AlGaAs Wires
The magneto-transport properties of two-dimensional electron gas (2DEG) at high magnetic fields and low temperatures are related to the edge and bulk states. These states cause nonlocal effects, such as nonlocal Shubnikov-de Haas (SdH) oscillations, and the influence of extra probes on the four-terminal resistance. We observed the selective diminishing of the down spin peak and the up spin peak in nonlocal SdH oscillations and investigated the influence of the extra probes which ostensibly have nothing to do with the four-terminal resistance. The influence of the extra probes on normal and nonlocal SdH measurement is explained by a decrease in the chemical potentials of the edge states at the extra probes.
KeywordsGate Voltage High Magnetic Field Edge State Bulk State Gate Area
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