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Robust electron pairing in the integer quantum hall effect regime

Author

Listed:
  • H.K. Choi

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • I. Sivan

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • A. Rosenblatt

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • M. Heiblum

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • V. Umansky

    (Braun Center for Submicron Research, Weizmann Institute of Science)

  • D. Mahalu

    (Braun Center for Submicron Research, Weizmann Institute of Science)

Abstract

Electron pairing is a rare phenomenon appearing only in a few unique physical systems; for example, superconductors and Kondo-correlated quantum dots. Here, we report on an unexpected electron pairing in the integer quantum Hall effect regime. The pairing takes place within an interfering edge channel in an electronic Fabry–Perot interferometer at a wide range of bulk filling factors, between 2 and 5. We report on three main observations: high-visibility Aharonov–Bohm conductance oscillations with magnetic flux periodicity equal to half the magnetic flux quantum; an interfering quasiparticle charge equal to twice the elementary electron charge as revealed by quantum shot noise measurements, and full dephasing of the pairs' interference by induced dephasing of the adjacent inner edge channel—a manifestation of inter-channel entanglement. Although this pairing phenomenon clearly results from inter-channel interaction, the exact mechanism that leads to electron–electron attraction within a single edge channel is not clear. We believe that substantial efforts are needed in order to clarify these intriguing and unexpected findings.

Suggested Citation

  • H.K. Choi & I. Sivan & A. Rosenblatt & M. Heiblum & V. Umansky & D. Mahalu, 2015. "Robust electron pairing in the integer quantum hall effect regime," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms8435
    DOI: 10.1038/ncomms8435
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    Cited by:

    1. Thomas Werkmeister & James R. Ehrets & Yuval Ronen & Marie E. Wesson & Danial Najafabadi & Zezhu Wei & Kenji Watanabe & Takashi Taniguchi & D. E. Feldman & Bertrand I. Halperin & Amir Yacoby & Philip , 2024. "Strongly coupled edge states in a graphene quantum Hall interferometer," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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