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Characterization of spin-orbit fields in InGaAs quantum wells
M. I. Dyakonov and V. Y. Kachorovskii, Sov. Phys. Semicond. 20, 110 (1986).
R. Winkler, Spin-Orbit Coupling Effects in Two-Dimensional Electron and Hole Systems ( Springer, Berlin, 2003).
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Coherent electron spin dynamics in 10-nm-wide InGaAs/InAlAs quantum wells is studied from 10 K to room temperature using time-resolved Kerr rotation. The spin lifetime exceeds 1 ns at 10 K and decreases with temperature. By varying the spatial overlap between pump and probe pulses, a diffusive velocity is imprinted on the measured electron spins and a spin precession in the spin-orbit field is measured. A Rashba symmetry of the spin-orbit interaction is determined. By comparing the spatial precession frequency gradient with the spin decay rate, an upper limit for the Rashba coefficients α of 2 × 10−12 eVm is estimated.
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