Low-energy μSR Investigations of Photo-induced Effects on a nm Scale

Abstract Photogeneratedcharge carriersopenthefascinating possibilitytotunecharge carrierconcentrationsinsitu,which provides a convenient way to change physical properties of a system. Low-energy μ SR is ideally suited for this kind of studies due to the perfect overlap of muon stopping distribution and the region of highest photon absorption close to the surface.We presenta descriptionof the currentexperimental setup and the resultsofa prototypeexperimentin Si. These results demonstratethevery promising prospectofextendingLE- μ SR to the investigation of photo-induced effects on a nanometer scale near surfaces, in thin films and heterostructures in general.