Abstract
Very small lead particles have been deposited with random distribution on top of high mobility GaAs/AlGaAs two-dimensional electron gas (2DEG) samples, and the effects on the transport properties of the 2DEG have been studied. Particles more than 5 µm in diameter cause magnetic disorder in the 2DEG in their superconducting state, giving rise to prominent structures in the magnetoresistance. In contrast, spherical particles of 80 to 300 nm diameter do not cause magnetic effects. Electrostatic effects of the nm-sized particles on the transport properties of wide 2DEG structures are very weak, whereas the magnetoresistance properties of a narrow channel were altered significantly in the presence of only a few lead particles smaller than 300 nm. The influence of particles of diameter <300 nm on wide 2DEG samples could be strongly enhanced by melting the particles on the surface.
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