Polarization-dependent spectral redshifts atν=1andν=2in a GaAs quantum well in high magnetic fields up to 60 T

Abstract

Polarized magnetophotoluminescence measurements performed on a wide parabolic GaAs/Al 0.2 Ga 0.8 As quantum well reveal the presence of spectral redshifts in the energy at filling factors ϭ1 and 2. The magnitude of these redshifts depends on the polarization and filling factor. While the values for the case of the Ϫ polarization agree with existing theories, the results for the ϩ polarizations are less understood.

Many-body luminescence from highly excited quantum-confined structures

“…The shakeup of spin waves, mentioned above, has been observed prominently in the magnetoluminescence spectra at filling factors close to 1, 3, and 5 [31,40,41,42,43,47]. At ν = 1, an asymmetric broadening of the luminescence peak with additional spectral weight on low energy side was observed for σ − -polarized light [47].…”

“…In one-side modulation-doped quantum wells, the aforementioned electron-hole symmetry is violated due to the spatial separation between the electron and valence hole planes that is caused by the interface potential. In such samples, polarization-dependent spectral redshifts were reported as the filling factor was swept through integer values [28,29,31,40,41,42,43]. These redshifts were attributed to the competition between interband Coulomb binding and electron self-energies in the final state [44,45].…”

“…The difference between below and above ν = 1 final state energies is thus E ex − E 0 > 0 in such asymmetric structures, which accounts for the redshift. A similar analysis was applied to the redshifts observed near ν = 2 filling factor [28,29,31,40,43]. In single heterojunctions, systematic studies of the electron-hole separation as a function of carrier concentration were carried out in Ref.…”

Enhanced magneto-optical oscillations from two-dimensional hole-gases in the presence of Mn ions

“…[4][5][6][7][8][9][10][11] Most of the letters present oscillations of the optical emission intensity and the peak energy, and there are some few polarization-resolved results concerning oscillations of the spin-splitting energy. Magneto-optical results from a series of samples with different Mn concentrations revealed an anomalous oscillation of the InGaAs QW emission as a function of the magnetic field, including both the peak and the spin-splitting energies.…”