Spin-dependent intersubband excitonic interactions have been investigated in GaAs/AlGaAs quantum wells by two-color pump and probe spectroscopy. We generated spin-polarized electrons in the lowest subband by resonant excitation of the heavy-hole exciton (E1 -HH1) and observed polarization-dependent broadening of the second-subband exciton resonance (E2 -HH2 and E2 -LH1). The exchange interaction between the first and the second-subband excitons is found to play a crucial role in polarization-dependent spectral modulation as well as spin-independent Coulomb screening.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)