Abstract
We study the magneto-transport properties of a quasi-ID GaAs/Al x Ga 1− x As ring of mobility 40 000 cm 2/V·a at 4 K. The inelastic scattering length is about 4000 Å while the sample length is of the order of 3 μm, so that we are in the diffusive regime. A variety of quantum interference phenomena are observed, including negative magneto-resistance, hole Aharonov-Bohm effect, and aperiodic/quasiperiodic resistance fluctuations. This rich variety enables us to estimate the sample conducting width and electron phase coherence length, l θ , so that we may attempt to obtain a consistent picture of these related phenomena. In addition, we obtain a magnetic field scale on which the hole oscillations disappear.
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