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The anisotropic splitting of intersubband spin plasmons, resulting from spin-orbit coupling, is studied by angle-resolved inelastic light scattering on a [001]-oriented GaAs/AlGaAs quantum well. Conrming theoretical predictions made in [C. A. Ullrich and M. A. Flatté, Phys. Rev. B 68, 235310 (2003)], this splitting is proven to exhibit a characteristic two-fold symmetry with the in-plane orientation, and to increase with increasing modulus of the excitation momentum. This opens the way to a more complete investigation, aiming at evidencing the existence of a collective spin-orbit eld driving these excitations

Anisotropic spin-orbit induced splitting of intersubband spin plasmons