title: Engineering spin waves in a high-spin ultracold Fermi gas.
abstract: We report on the detailed study of multicomponent spin waves in an s=3/2 Fermi gas where the high spin leads to novel tensorial degrees of freedom compared to s=1/2 systems. The excitations of a spin-nematic state are investigated from the linear to the nonlinear regime, where the tensorial character is particularly pronounced. By tuning the initial state we engineer the tensorial spin-wave character, such that the magnitude and the sign of the counterflow spin currents are effectively controlled. A comparison of our data with numerical and analytical results shows good agreement.
authors.affiliation: Institut für Laser-Physik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Heinze
authors.forename: J S
authors.initials: JS
authors.lastname: Krauser
authors.forename: N
authors.initials: N
authors.lastname: Fläschner
authors.forename: K
authors.initials: K
authors.lastname: Sengstock
authors.forename: C
authors.initials: C
authors.lastname: Becker
authors.forename: U
authors.initials: U
authors.lastname: Ebling
authors.forename: A
authors.initials: A
authors.lastname: Eckardt
authors.forename: M
authors.initials: M
authors.lastname: Lewenstein