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File: Spin Currents in a Coherent Exciton Gas

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A. A. High, A. T. Hammack, J. R. Leonard, Sen Yang, L.V. Butov, T. Ostatnicky, M. Vladimirova, A.V. Kavokin, T. C. H. Liew, K. L. Campman, and A. C. Gossard


We report the observation of spin currents in a coherent gas of indirect excitons. The realized longrange spin currents originate from the formation of a coherent gas of bosonic pairs—a new mechanism to suppress the spin relaxation. The spin currents result in the appearance of a variety of polarization patterns, including helical patterns, four-leaf patterns, spiral patterns, bell patterns, and periodic patterns. We demonstrate control of the spin currents by a magnetic field. We also present a theory of coherent exciton spin transport that describes the observed exciton polarization patterns and indicates the trajectories of the spin currents.

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