Repulsive Interaction in the Macroscopically Ordered Exciton State

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The exciton photoluminescence (PL) energy varies in concert with the intensity along the circumference of the ring, with the largest energy found in the brightest regions. This shows that the MOES is characterized by the repulsive interaction and is not driven by the attractive interaction.

Repulsive interaction is typical for indirect excitons, which are dipoles oriented perpendicular to the quantum well plane.

Sen Yang, A.V. Mintsev, A.T. Hammack, L.V. Butov, and A.C. Gossard, Repulsive interaction in the macroscopically ordered exciton state in GaAs/AlxGa1−xAs coupled quantum well structures, cond-mat/0608342 (2006); Phys. Rev. B 75, 033311 (2007).