Spin-orbit fields in asymmetric (001) quantum wells

Details Spin-orbit fields in asymmetric (001) quantum wells Spin-orbit fields in asymmetric (001) quantum wells

2010-10-11

arxiv.org/abs/1010.2142v1

Phys. Rev. B 83, 041301(R) (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevB.83.041301

We measure simultaneously the in-plane electron g-factor and spin relaxation rate in a series of undoped inversion-asymmetric (001)-oriented GaAs/AlGaAs quantum wells by spin-quantum beat spectroscopy. In combination the two quantities reveal the absolute values of both the Rashba and the Dresselhaus coefficients and prove that the Rashba coefficient can be negligibly small despite huge conduction band potential gradients which break the inversion symmetry. The negligible Rashba coefficient is a consequence of the 'isomorphism' of conduction and valence band potentials in quantum systems where the asymmetry is solely produced by alloy variations.

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