Coulomb-driven organization and enhancement of spin-orbit fields in collective spin excitations

Abstract

Spin-orbit (SO) fields in a spin-polarized electron gas are studied by angle-resolved inelastic light scattering on a CdMnTe quantum well. We demonstrate a striking organization and enhancement of SO fields acting on the collective spin excitation (spin-flip wave). While individual electronic SO fields have a broadly distributed momentum dependence, giving rise to D'yakonov-Perel' dephasing, the collective spin dynamics is governed by a single collective SO field which is drastically enhanced due to many-body effects. The enhancement factor is experimentally determined. These results provide a powerful indication that these constructive phenomena are universal to collective spin excitations of conducting systems.

5 pages, 4 figures

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• Emergence of the persistent spin helix in semiconductor quantum wells
• Measurement of Rashba and Dresselhaus spin-orbit magnetic fields
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• Full Electrical Control of the Electron Spin Relaxation in GaAs Quantum Wells
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• Collective spin modes in Fermi liquids with spin-orbit coupling
• Spin-valley Silin modes in graphene with substrate-induced spin-orbit coupling
• Spin-orbit interaction enabled electronic Raman scattering from charge collective modes
• Phonon-Induced Collective Modes in Spin-Orbit Coupled Polar Metals
• Spin waves in doped graphene: a time-dependent spin-density-functional approach to collective excitations in paramagnetic two-dimensional Dirac fermion gases
• Spin precession and spin waves in a chiral electron gas: beyond Larmor's theorem
• Resonant Edelstein and inverse-Edelstein effects, charge-to-spin conversion, and spin pumping from chiral-spin modes
• Zero-field spin resonance in graphene with proximity-induced spin-orbit coupling
• Electronic Raman scattering from 2D metals with broken inversion symmetry