Photoluminescence measurements of InP quantum dots in pulsed magnetic fields

We report the first photoluminescence (PL) measurements on stacked layers o f self-assembled InP quantum dots in pulsed magnetic fields up to 50 T at 4 .2 K. A strong increase of the diamagnetic shift with magnetic field parall el and perpendicular to the growth direction is observed by decreasing the stacked layer separation from 8 to 4 nm, indicating that in latter case the quantum dot layers are strongly coupled. This is confirmed by the decrease in PL line width, which is determined by the height homogeneity of a singl e dot or by the fluctuation of the total height of the coupled layers. (C) 1998 Elsevier Science B.V. All rights reserved.