Magneto-quantum transport in a quasi-one-dimensional GaAs/AlxGa1-xAs ring
We study the magneto-transport properties of a quasi-ID GaAs/AlxGa1-xAs ring of mobility 40 000 cm2/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, lθ, 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. © 1987.
Chang, AM; Timp, G; Chang, TY; Cunningham, JE; Chelluri, B; Mankiewich, PM; Behringer, RE; Howard, RE
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