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The macroscopically ordered exciton state (MOES) - a periodic array of beadswith spatial order on a macroscopic length - appears in the external excitonrings at low temperatures below a few Kelvin. Here, we report on theexperimental study of the interaction in the MOES. The exciton PL energy variesin concert with the intensity along the circumference of the ring, with thelargest energy found in the brightest regions. This shows that the MOES ischaracterized by the repulsive interaction and is not driven by the attractiveinteraction.Comment: 3 pages, 3 figure

physical review. b, condensed matter and materials physics

Repulsive interaction in the macroscopically ordered exciton state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>GaAs</mml:mi><mml:mo>∕</mml:mo><mml:msub><mml:mi>Al</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>Ga</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi>As</mml:mi></mml:mrow></mml:math>coupled quantum well structures

Repulsive interaction in the macroscopically ordered exciton state inGaAs∕AlxGa1−xAscoupled quantum well structures