Spin currents and spin textures are observed in a coherent gas of indirect excitons. Applied magnetic fields bend the spin current trajectories and transform patterns of linear polarization from helical to spiral and patterns of circular polarization from four-leaf to bell-like-with-inversion.
@article{arxiv.1302.3852,
title = {Spin currents in a coherent exciton gas},
author = {A. A. High and A. T. Hammack and J. R. Leonard and Sen Yang and L. V. Butov and T. Ostatnicky and M. Vladimirova and A. V. Kavokin and T. C. H. Liew and K. L. Campman and A. C. Gossard},
journal= {arXiv preprint arXiv:1302.3852},
year = {2015}
}