Quantum interference in artificial band structures.
Magnetotransport experiments on two-dimensional electron systems with an atomically precise, one-dimensional potential modulation reveal striking quantum interference oscillations. Within a semiclassical framework, they are recognized either as self-interference along closed orbits, many of them rendered possible by magnetic breakdown between Fermi contour segments of the artificial band structure, or as interference-enhanced backscattering. The known commensurability oscillations appear as a special case of the latter mechanism.
Deutschmann
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Walter Schottky Institut, Technische Universität München, 85748 Garching, Germany.
Wegscheider
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Rother
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Bichler
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Abstreiter
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Albrecht
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Smet
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