Probing the trapping and thermal activation dynamics of excitons at single twin defects in GaAs-AlGaAs core-shell nanowires

Abstract

20 GHz that dominates the population dynamics of bound excitons at T = 6 K. At elevated temperature, the detrapping rate is found to adhere to a thermally activated behavior characterized by a thermal activation energy of EA = 5.8±1.0 meV, very close to the energy spacing of bound and free exciton emission features. This observation implies that bound excitons are thermally activated into the excitonic continuum without the need to overcome additional energetic barriers. © IOP Publishing and Deutsche Physikalische Gesellschaft.