Reduced binding energy of the symmetric heavy-hole exciton in GaAs/AlxGa1

Abstract

Discrete peaks, which are identified as the excited 2s state of the n =1 symmetric heavy-hole exciton, are observed in GaAs/Al"Ga, "As symmetric coupled double-quantum-well (SCDQW) samples by combining unpolarized and polarized photoluminescence-excitation measurements.The 1s-2s splitting of symmetric heavy-hole excitons is accurately determined in the SCDQW's. The ls-2s splitting is significantly reduced compared to uncoupled quantum wells.A) sGa"As AL"Ga"As GaAs GaAs Lb

The Exciton Transition Energies in Symmetric Double GaAs/AlxGa1-xAs Quantum Wells

“…However, the work on parabolic double quantum wells is quite restricted [9,10], although the exciton binding energies [11] and exciton transition energies [12] in molecular beam epitaxy manufactured GaAs/Al 0.3 Ga 0. 7 As coupled symmetric rectangular double quantum well structures are measured using photoluminence (PL) and photoluminescence excitation (PLE) spectroscopy techniques.…”