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Electron density magnification of the collective spin-orbit field in quantum wells

Abstract : The spin-orbit field acting on the spin waves of a spin-polarized electron gas is studied by in-elastic light scattering on a CdMnTe quantum well. Above-barrier illumination allows us to vary the electronic density and control the collective Rashba and Dresselhaus coupling constants. We demonstrate that the enhancement between the single-particle and the collective spin-orbit field increases with increasing electronic density. This result is reproduced by a first-principles calculation. This behavior, which is opposite to usual Coulombic spin enhancements, reveals a novel aspect of the interplay of spin-orbit and Coulomb interactions in collective spin modes.
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Florent Baboux, Florent Perez, C. A. Ullrich, G. Karczewski, T. Wojtowicz. Electron density magnification of the collective spin-orbit field in quantum wells. Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2015, 92 (12), pp.125307. ⟨10.1103/PhysRevB.92.125307⟩. ⟨hal-01324841⟩

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