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Electronic interferometers using the chiral, one-dimensional (1D) edge channels of the quantum Hall effect (QHE) can demonstrate a wealth of fundamental phenomena. The recent observation of phase jumps in a single edge channel Fabry-Pérot (FP) interferometer revealed anyonic quasiparticle exchange statistics in the fractional QHE. When multiple edge channels are involved, FP interferometers have exhibited anomalous Aharonov-Bohm (AB) interference frequency doubling, suggesting interference of 𝟐𝒆 quasiparticles. Here, we use a highly tunable graphene-based QHE FP interferometer to observe the connection between integer QHE interference phase jumps and AB frequency doubling, unveiling the intricate nature of inter edge state coupling in a multichannel QHE interferometer. By tuning the electron density continuously from the QHE filling factor 𝝂 < 𝟐 to 𝝂 > 𝟕, we observe periodic interference phase jumps leading to AB frequency doubling. Our observations clearly demonstrate that in our samples the combination of repulsive Coulomb interaction between the spin-split, copropagating edge channels and charge quantization explains the frequency-doubled regime without electron pairing, via a near-perfect anti-correlation between the two edge channels. Our results show that interferometers are sensitive probes of microscopic interactions between edge states, which can cause strong correlations between chiral 1D channels even in the integer QHE regime.

権利情報:

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

キーワード: Electronic interferometers, quantum Hall effect, phase jumps

刊行年月日: 2024-08-02

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Communications (ISSN: 20411723) vol. 15 issue. 1 6533

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/s41467-024-50695-1

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更新時刻: 2025-02-06 12:30:50 +0900

MDRでの公開時刻: 2025-02-06 12:30:50 +0900