Jannes Heinze, Jasper Simon Krauser, Nick Fläschner, Klaus Sengstock, Christoph Becker, Ulrich Ebling, Andre Eckardt, Maciej Lewenstein
We report on the detailed study of multi-component 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 sign of the counterflow spin-currents are effectively controlled. A comparison of our data with numerical and analytical results shows excellent agreement.
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http://arxiv.org/abs/1302.4323
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