The influence of reduced dimensionality on the spin-splitting in GaAlAs/GaAs quantum wires

Abstract

We study the role of reduced dimensionality on the quantum magnetotransport in quasi-ballistic GaAlAs GaAs quantum wires. We observe strong "antiresonances" in G(B), related to the backscattering of edge currents induced by disorder. We find that the spin-related conductance plateaux are strongly suppressed due to the many-body effects. In the device with low carrier density we have been able to induce the spin-splitting and observe the e2 h plateau in high magnetic fields. From the temperature dependence of this plateau we show that the g-factor in wires is indeed much smaller than in the 2D case. We find also that the scattering rate at the "antiresonance" depends linearly on the temperature. © 1994.