We report the first observation of magnetotransport in piezoelectrically active heterostructures. Well-resolved quantum Hall plateaus and magnetoresistance minima are observed for two-dimensional hole gases confined in [111] oriented strained-layer Ga1−xInxSb/GaSb quantum wells with a piezoelectric field, of order 1×105 V/cm. We discuss the enhanced carrier densities induced by the in-built field and the differences observed between [111]A and [111]B orientations. Comparisons are made with simultaneously grown [001] structures. Stark energy shifts observed in photoluminescence are well accounted for by the estimated electric field.
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Martin et al. (1991) studied this question.
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