Spatially and time-resolved imaging of transport of indirect excitons in high magnetic fields

摘要

We present the direct measurements of magnetoexciton transport. Excitons givethe opportunity to realize the high magnetic field regime for composite bosonswith magnetic fields of a few Tesla. Long lifetimes of indirect excitons allowthe study kinetics of magnetoexciton transport with time-resolved opticalimaging of exciton photoluminescence. We performed spatially, spectrally, andtime-resolved optical imaging of transport of indirect excitons in highmagnetic fields. We observed that increasing magnetic field slows downmagnetoexciton transport. The time-resolved measurements of the magnetoexcitontransport distance allowed for an experimental estimation of the magnetoexcitondiffusion coefficient. An enhancement of the exciton photoluminescence energyat the laser excitation spot was found to anti-correlate with the excitontransport distance. A theoretical model of indirect magnetoexciton transport ispresented and is in agreement with the experimental data.