Magneto-optical study of electron occupation and hole wave functions in stacked self-assembled InP quantum dots

We have studied the magnetophotoluminescence of doubly stacked layers of se lf-assembled InP quantum dots in a GaInP matrix. 4.0 +/-0.1 monolayers of I nP were deposited in the lower layer of each sample, whereas in the upper l ayer 3.9, 3.4, and 3.0 monolayers were used. Low-temperature photoluminesce nce measurements in zero magnetic field are used to show that, in each case , only one layer of dots is occupied by an electron, and imply that when th e amount of InP in both layers is the same, the dots in the upper layer are larger. High-field photoluminescence data reveal that the position and ext ent of the hole wave function are strongly dependent on the amount of InP i n the stack. (C) 2001 American Institute of Physics.