Magnetic field effects in InP self-assembled quantum dots

Optical properties of InP self-assembled quantum dots (SADs) were investiga ted in the presence of a magnetic field up to 10 T. By using a mu m-sized I nP/GaInP mesa, we succeeded in observing sharp photoluminescence (PL) lines from a single InP quantum dot. With the increase of the magnetic field, th e diamagnetic shift and the Zeeman splitting were clearly observed in the F araday configuration. The diamagnetic coefficient and the effective g-value of the confined excitons show fluctuations reflecting dispersion in the si ze and the shape of the quantum dots. The estimated g-value of the InP quan tum dot is about half of that of the bulk InP because of the heavy-hole lig ht-hole band mixing. (C) 1998 Elsevier Science B.V. All rights reserved.