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Macroscopically ordered state in an exciton system

Author

Listed:
  • L. V. Butov

    (E. O. Lawrence Berkeley National Laboratory
    Russian Academy of Sciences)

  • A. C. Gossard

    (University of California)

  • D. S. Chemla

    (E. O. Lawrence Berkeley National Laboratory
    University of California at Berkeley)

Abstract

There is a rich variety of quantum liquids—such as superconductors, liquid helium and atom Bose–Einstein condensates—that exhibit macroscopic coherence in the form of ordered arrays of vortices1,2,3,4. Experimental observation of a macroscopically ordered electronic state in semiconductors has, however, remained a challenging and relatively unexplored problem. A promising approach for the realization of such a state is to use excitons, bound pairs of electrons and holes that can form in semiconductor systems. At low densities, excitons are Bose-particles5, and at low temperatures, of the order of a few kelvin, excitons can form a quantum liquid—that is, a statistically degenerate Bose gas or even a Bose–Einstein condensate5,6,7. Here we report photoluminescence measurements of a quasi-two-dimensional exciton gas in GaAs/AlGaAs coupled quantum wells and the observation of a macroscopically ordered exciton state. Our spatially resolved measurements reveal fragmentation of the ring-shaped emission pattern into circular structures that form periodic arrays over lengths up to 1 mm.

Suggested Citation

  • L. V. Butov & A. C. Gossard & D. S. Chemla, 2002. "Macroscopically ordered state in an exciton system," Nature, Nature, vol. 418(6899), pages 751-754, August.
  • Handle: RePEc:nat:nature:v:418:y:2002:i:6899:d:10.1038_nature00943
    DOI: 10.1038/nature00943
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    1. Charalambos Louca & Armando Genco & Salvatore Chiavazzo & Thomas P. Lyons & Sam Randerson & Chiara Trovatello & Peter Claronino & Rahul Jayaprakash & Xuerong Hu & James Howarth & Kenji Watanabe & Taka, 2023. "Interspecies exciton interactions lead to enhanced nonlinearity of dipolar excitons and polaritons in MoS2 homobilayers," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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