Abstract
The transition of two-dimensional electron systems (2DES) with intentional disorder in form of a δ-layer doped with beryllium into quantum Hall insulators composed of separate electron droplets is examined by magnetotransport and far-infrared spectroscopy. We observe the percolation threshold at filling factors clearly below ν c = 1 2 that is expected for statistical disorder. The far-infrared excitations bear strong resemblance to magnetoplasmons of density-modulated 2DES and antidot systems in regular arrays. Thus, a perceptible degree of short-range order between the sites of the beryllium acceptors is uncovered.
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