A High Resolution Cathodoluminescence Microscopy Utilizing Magnetic Field

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Abstract
We propose a new principle to improve spatial resolution of cathodoluminescence microscopy (CL). The resolution of conventional CL is limited by minority carrier lateral diffusion, typically a few microns. The principle, which we named Lorentz force carrier confinement (LC), is to block the lateral diffusion by placing carriers in a circular orbit in terms of the Lorentz force under a vertical magnetic field. Detailed hetero-interface structures of GaAs-AlGaAs quantum wells have been successfully visualized, using the principle. The spatial resolution of LC-CL is improved to be a few thousand Angstrom by applying 0.8 Tesla.