Abstract
The magnetoresistance and Hall resistance in a quasi-ballistic multi-terminal quantum wire of GaAs/AlGaAs heterostructure have been investigated. The Shubnikov-de Haas (SdH.) oscillations in the non-local geometry, where the current probes and voltage probes are separated, are observed at high magnetic fields, in addition to the observation of the last Hall plateau, the negative bend and transfer resistance at low magnetic fields. The amplitudes of SdH. oscillations decrease with increasing nominal separation length between the current and voltage probes. The decay length (L s) decreases from 3.5μm at B=1T to 2.0μm at B=5T with increasing magnetic field. In all cases, L s is longer than the ballistic mean free path of electrons. Possible origins about this magnetic field dependence of L s are discussed in connection with the edge states of the quantum wire.
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