Photo-thermal transitions of magneto-excitons in quantum wells
By monitoring changes in excitonic photoluminescence (PL) that are induced by terahertz (THz) radiation, we observe resonant THz absorption by magnetoexcitons in GaAs/AlGaAs quantum wells. Changes in the PL spectrum are explored as a function of temperature and magnetic field, providing insight into the mechanisms which allow THz absorption to modulate PL. The strongest PL-quenching occurs at the heavy hole $1s\to 2p^+$ resonance where heavy hole excitons are photo-thermally converted into light hole excitons.
cond-mat.str-el↗