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Dynamics of Photo-excited Spins in InSb Based Quantum Wells

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arxiv 0807.2660 v1 pith:M4F7QX4X submitted 2008-07-16 cond-mat.mtrl-sci

Dynamics of Photo-excited Spins in InSb Based Quantum Wells

classification cond-mat.mtrl-sci
keywords spinrelaxationdopingdynamicsfluenceinsbmeasurementsobserved
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We report time resolved measurements of spin relaxation in doped and undoped InSb quantum wells using degenerate and two-color magneto-optical Kerr effect techniques. We observed that the photo-excited spin dynamics are strongly influenced by laser excitation fluence and the doping profile of the samples. In the low fluence regime, an oscillatory pattern was observed at low temperatures ($\leq$ 77 K) in the samples with an asymmetric doping profile which 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.

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