Spin Texture in a Cold Exciton Gas

ORAL

Abstract

We report on the observation of a spin texture in a cold exciton gas in a GaAs/AlGaAs coupled quantum well structure. The spin texture is observed around the rings in the exciton emission pattern. The observed phenomena include: a ring of linear polarization, a vortex of linear polarization with polarization perpendicular to the radial direction, an anisotropy in the exciton flux, a skew of the exciton fluxes in orthogonal circular polarizations and a corresponding four-leaf pattern of circular polarization, and a periodic spin texture. These phenomena emerge when the exciton gas is cooled below a few Kelvin.

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Authors

  • Alexander High

    UC San Diego

  • Aaron Hammack

    UC San Diego

  • Jason Leonard

    University of California at San Diego, UC San Diego

  • Sen Yang

    UC San Diego

  • Leonid Butov

    University of California at San Diego, UC San Diego, University of California, San Diego

  • Tomas Ostatnicky

    Charles University, Prague

  • Alexei Kavokin

    University of Southhampton

  • Arthur Gossard

    University of California at Santa Barbara, UC Santa Barbara, University of California Santa Barbara