Two-Dimensional Excitons in Large Magnetic Field Gradients
Abstract
Inhomogeneous magnetic fields are used to exert a magnetic force on two-dimensional excitons. The large field gradients are produced by positioning a thin magnetized stripe of dysprosium on top of a semi-magnetic CdMnTe/CdMgTe quantum well. By measuring the photoluminescence energy and intensity, spatially resolved with μm resolution, the actual value of the local magnetic force, which can be as high as 0.4 meV/μm, and its effect on the exciton motion are determined.