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Spin relaxation times in GaAs x Sb 1Ϫx quantum wells are measured at 295 K using time-resolved circular dichroism induced by 1.5 m, 100 fs pulses. Values of 1.03 and 0.84 ps are obtained for samples with xϭ0 and 0.188, respectively. These times are Ͼ5 times shorter than those in InGaAs and InGaAsP wells with similar band gaps. The shorter relaxation times are attributed to the larger spin-orbit conduction-band splitting in the Ga͑As͒Sb system, consistent with the D'yakonov-Perel theory of spindoi:10.1063/1.125422 fatcat:7n7f6mr3fbdy3dw544ybvw2cq4