Spin-orbit effects on the Larmor dispersion relation in GaAs quantum wells

Details Spin-orbit effects on the Larmor dispersion relation in GaAs quantum wells Spin-orbit effects on the Larmor dispersion relation in GaAs quantum wells

2006-01-27

arxiv.org/abs/cond-mat/0601635v1

Phys. Rev. B73 125302 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To be published in Physical Review B

Scientific paper

10.1103/PhysRevB.73.125302

We have studied the relevance of spin-orbit coupling to the dispersion 00009 relation of the Larmor resonance observed in inelastic light scattering and electron-spin resonance experiments on GaAs quantum wells. We show that the spin-orbit interaction, here described by a sum of Dresselhaus and Bychkov-Rashba terms, couples Zeeman and spin-density excitations. We have evaluated its contribution to the spin splitting as a function of the magnetic field $B$, and have found that in the small $B$ limit, the spin-orbit interaction does not contribute to the spin splitting, whereas at high magnetic fields it yields a $B$ independent contribution to the spin splitting given by $2(\lambda_R^2-\lambda_D^2)$, with $\lambda_{R,D}$ being the intensity of the Bychkov-Rashba and Dresselhaus spin-orbit terms.

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