EPJ Web of Conferences 40, 18002 (2013)
https://doi.org/10.1051/epjconf/20134018002

Anisotropic spin-orbit induced splitting of intersubband spin plasmons^*

¹ Institut des Nanosciences de Paris, CNRS/Université Paris VI, Paris 75005, France
² Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA
³ Department of Physics, University of York, York YO10 5DD, United Kingdom

^a e-mail: baboux@insp.upmc.fr

Abstract

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. Confirming 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 field driving these excitations.