REDUCED MASS OF AN EXCITON IN A MONOLAYER-WIDE-INAS GAAS QUANTUM-WELLFROM MAGNETOPHOTOLUMINESCENCE MEASUREMENTS

Magnetophotoluminescence experiments were conducted on samples consist ing of nominally one-monolayer-wide InAs quantum wells (QWs) with GaAs barriers grown on (001) substrate. From these measurements, we have f or the first time deduced the reduced mass of the exciton associated w ith the InAs QW. The reduced mass is found to be lower than that predi cted theoretically using bulk effective masses, the reduction probably arising from a reduction in InAs heavy-hole mass due to heavy- and li ght-hole subband mixing in the QW.