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Moiré pattern of interference dislocations in condensate of indirect excitons

Author

Listed:
  • J. R. Leonard

    (University of California at San Diego)

  • Lunhui Hu

    (University of California at San Diego)

  • A. A. High

    (University of California at San Diego)

  • A. T. Hammack

    (University of California at San Diego)

  • Congjun Wu

    (University of California at San Diego)

  • L. V. Butov

    (University of California at San Diego)

  • K. L. Campman

    (University of California at Santa Barbara)

  • A. C. Gossard

    (University of California at Santa Barbara)

Abstract

Interference patterns provide direct measurement of coherent propagation of matter waves in quantum systems. Superfluidity in Bose–Einstein condensates of excitons can enable long-range ballistic exciton propagation and can lead to emerging long-scale interference patterns. Indirect excitons (IXs) are formed by electrons and holes in separated layers. The theory predicts that the reduced IX recombination enables IX superfluid propagation over macroscopic distances. Here, we present dislocation-like phase singularities in interference patterns produced by condensate of IXs. We analyze how exciton vortices and skyrmions should appear in the interference experiments and show that the observed interference dislocations are not associated with these phase defects. We show that the observed interference dislocations originate from the moiré effect in combined interference patterns of propagating condensate matter waves. The interference dislocations are formed by the IX matter waves ballistically propagating over macroscopic distances. The long-range ballistic IX propagation is the evidence for IX condensate superfluidity.

Suggested Citation

  • J. R. Leonard & Lunhui Hu & A. A. High & A. T. Hammack & Congjun Wu & L. V. Butov & K. L. Campman & A. C. Gossard, 2021. "Moiré pattern of interference dislocations in condensate of indirect excitons," Nature Communications, Nature, vol. 12(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-21353-7
    DOI: 10.1038/s41467-021-21353-7
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    Cited by:

    1. Yusuke Morita & Kosuke Yoshioka & Makoto Kuwata-Gonokami, 2022. "Observation of Bose-Einstein condensates of excitons in a bulk semiconductor," Nature Communications, Nature, vol. 13(1), pages 1-9, December.

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