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We report time resolved measurements of spin relaxation in doped and undopedInSb quantum wells using degenerate and two-color magneto-optical Kerr effecttechniques. We observed that the photo-excited spin dynamics are stronglyinfluenced by laser excitation fluence and the doping profile of the samples.In the low fluence regime, an oscillatory pattern was observed at lowtemperatures ($\leq$ 77 K) in the samples with an asymmetric doping profilewhich might be attributed to the quasi-collision-free spin relaxation regime.Our measurements also suggest the influence of the barrier materials(Al$_{x}$In$_{1-x}$Sb) on the spin relaxation in these material systems.

Dynamics of Photo-excited Spins in InSb Based Quantum Wells