Magnetotransport of piezoelectric [111] oriented strained quantum wells

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Abstract
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.