EXCITON MOTION IN LARGE MAGNETIC-FIELD GRADIENTS

High in-plane magnetic field gradients, as large as 6 x 10(4) T/m, pro duced with a magnetized thin dysprosium stripe, are used to control th e lateral motion of excitons in a 8 nm In0.2Ga0.8As quantum well. By m easuring the exciton photoluminescence (PL) energy and intensity, spat ially resolved with mu m resolution. it is shown that diamagnetic exci tons are forced to regions of low magnetic field, due to the interacti on of the magnetic moment with the non-homogeneous field.