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
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