Characterization of spin-orbit fields in InGaAs quantum wells

Abstract

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 SOI is determined. By comparing the spatial precession frequency gradient with the spin decay rate, an upper limit for the Rashba coefficients $\alpha$ of 2$\times$10${}^{-12}$ eVm is estimated.

References in corpus (6)

• Coherent control of a single electron spin with electric fields
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Cited by in corpus (1)

• Electrical control of spin relaxation anisotropy during drift transport in a two-dimensional electron gas