Magnetic field as a tuning knob for edge mode interaction in integer quantum Hall interferometers

Abstract

The quantum Hall interferometer has been shown to be a powerful tool for probing both the nature of the chiral modes present at the edges of these systems and the interactions between them. Strong inter-edge mode interactions can lead the system into a regime where the period of the interferometer signal corresponds to an insertion of a half-quantum flux h/2e, rather than the standard flux quantum h/e. Using a highly tunable bilayer graphene device, we are able to measure the prevalence of both the h/e-period and the doubled-frequency regimes as a function of magnetic field, providing insight into the microscopic nature of the doubling mechanism. Furthermore, we are able to push our device to a regime where double-frequency oscillations coexist with a superimposed period-h/e pattern associated with the inner chiral modes farther from the edge. We argue that this regime has a natural interpretation in a picture of the frequency doubling being caused by strong capacitive couplings between the edge modes.

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BibTeX RIS

BibTeX

@misc{ma2026magnetic,
  title = {{Magnetic field as a tuning knob for edge mode interaction in integer quantum Hall interferometers}},
  author = {Ning Ma and Tevž Lotrič and Kenji Watanabe and Takashi Taniguchi and Steven H. Simon and Mitali Banerjee},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.03284},
  eprint = {2611.03284},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.03284},
  note = {CC BY 4.0},
}

RIS

TY  - UNPB
TI  - Magnetic field as a tuning knob for edge mode interaction in integer quantum Hall interferometers
AU  - Ning Ma
AU  - Tevž Lotrič
AU  - Kenji Watanabe
AU  - Takashi Taniguchi
AU  - Steven H. Simon
AU  - Mitali Banerjee
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.03284
UR  - https://arxiv.org/abs/2611.03284
AB  - The quantum Hall interferometer has been shown to be a powerful tool for probing both the nature of the chiral modes present at the edges of these systems and the interactions between them. Strong inter-edge mode interactions can lead the system into a regime where the period of the interferometer signal corresponds to an insertion of a half-quantum flux h/2e, rather than the standard flux quantum h/e. Using a highly tunable bilayer graphene device, we are able to measure the prevalence of both the h/e-period and the doubled-frequency regimes as a function of magnetic field, providing insight into the microscopic nature of the doubling mechanism. Furthermore, we are able to push our device to a regime where double-frequency oscillations coexist with a superimposed period-h/e pattern associated with the inner chiral modes farther from the edge. We argue that this regime has a natural interpretation in a picture of the frequency doubling being caused by strong capacitive couplings between the edge modes.
ER  -

Abstract

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