title: Spin-Orbit Twisted Spin Waves: Group Velocity Control.
abstract: We present a theoretical and experimental study of the interplay between spin-orbit coupling (SOC), Coulomb interaction, and motion of conduction electrons in a magnetized two-dimensional electron gas. Via a transformation of the many-body Hamiltonian we introduce the concept of spin-orbit twisted spin waves, whose energy dispersions and damping rates are obtained by a simple wave-vector shift of the spin waves without SOC. These theoretical predictions are validated by Raman scattering measurements. With optical gating of the density, we vary the strength of the SOC to alter the group velocity of the spin wave. The findings presented here differ from that of spin systems subject to the Dzyaloshinskii-Moriya interaction. Our results pave the way for novel applications in spin-wave routing devices and for the realization of lenses for spin waves.
authors.affiliation: Institut des Nanosciences de Paris, CNRS/Université Paris VI, Paris 75005, France.
authors.forename: F
authors.initials: F
authors.lastname: Perez
authors.affiliation: Institut des Nanosciences de Paris, CNRS/Université Paris VI, Paris 75005, France.|Laboratoire de Photonique et de Nanostructures, LPN/CNRS, 91460 Marcoussis, France.
authors.forename: F
authors.initials: F
authors.lastname: Baboux
authors.affiliation: Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Ullrich
authors.affiliation: Department of Physics, University of York, York YO10 5DD, United Kingdom.
authors.forename: I
authors.initials: I
authors.lastname: D'Amico
authors.affiliation: Department of Physics and Astronomy, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: G
authors.initials: G
authors.lastname: Vignale
authors.affiliation: Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland.
authors.forename: G
authors.initials: G
authors.lastname: Karczewski
authors.affiliation: Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw, Poland.
authors.forename: T
authors.initials: T
authors.lastname: Wojtowicz