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Magneto‐photoluminescence studies of a novel quantum dot–quantum well coupled system

We report a study of novel structures in which an InSb quantum dot (QD) layer in GaSb is coupled to a nearby narrow InAs quantum well (QW). Magnetic fields have been used to probe the photoluminescence (PL) of the dots and the wells separately and in the coupled structures. We have found that the introduction of the dot–well coupling leads to a dramatic suppression of the diamagnetic shift of the exciton when the magnetic field is oriented parallel to the well plane. The observed shift is 1–2 meV with an applied field of 17 T. In contrast, when the field is perpendicular to the layer plane, there is little difference in the response of the coupled structures compared to that of the quantum wells on their own, suggesting that the behaviour is dominated by the motion of the electrons in the wells.