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The pairing of electrons is ubiquitous in electronic systems featuring attractive inter–electron interactions, as exemplified in superconductors. Counter- intuitively, it can also be mediated in certain circumstances by the repulsive Coulomb interaction alone. Quantum Hall (QH) Fabry–Pérot interferometers (FPIs) tailored in a two–dimensional electron gas under a perpendicular magnetic field have been argued to exhibit such an unusual electron pairing, seemingly without attractive interactions. Here, we show evidence in graphene QH FPIs, revealing not only a similar electron pairing at bulk filling factor νB = 2, but also an unforeseen emergence of electron tripling characterized by a fractional Aharonov–Bohm flux period of h/3e (h is the Planck constant and e the electron charge) at νB = 3. Leveraging plunger–gate spectroscopy, we demonstrate that electron pairing (tripling) involves correlated charge trans- port on two (three) entangled QH edge channels. This spectroscopy indicates a quantum interference flux periodicity determined by the sum of the phases acquired by the distinct QH edge channels having slightly different interfering areas. Phase jumps observed in the pajama maps can be accounted for by the frequency beating between pairing/tripling modes and the outer interfer- ing edge.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

キーワード: Electron pairing, quantum Hall, graphene

刊行年月日: 2024-11-20

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 10064

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41467-024-54211-3

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更新時刻: 2025-02-05 12:31:51 +0900

MDRでの公開時刻: 2025-02-05 12:31:51 +0900