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Quantum Hall Interferometry in Triangular Domains of Marginally Twisted Bilayer Graphene

Mahapatra, PS and Garg, M and Ghawri, B and Jayaraman, A and Watanabe, K and Taniguchi, T and Ghosh, A and Chandni, U (2022) Quantum Hall Interferometry in Triangular Domains of Marginally Twisted Bilayer Graphene. In: Nano Letters, 22 (14). pp. 5708-5714.

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Official URL: https://doi.org/10.1021/acs.nanolett.2c00627


Quantum Hall (QH) interferometry provides an archetypal platform for the experimental realization of braiding statistics of fractional QH states. However, the complexity of observing fractional statistics requires phase coherence over the length of the interferometer, as well as suppression of Coulomb charging energy. Here, we demonstrate a new type of QH interferometer based on marginally twisted bilayer graphene (mtBLG), with a twist angle θ ≈ 0.16°. With the device operating in the QH regime, we observe distinct signatures of electronic Fabry-Pérot and Aharonov-Bohm oscillations of the magneto-thermopower in the density-magnetic field phase space, at Landau level filling factors ν = 4, 8. We find that QH interference effects are intrinsic to the triangular AB/BA domains in mtBLG that show diminished Coulomb charging effects. Our results demonstrate phase-coherent interference of QH edge modes without any additional gate-defined complex architecture, which may be beneficial in experimental realizations of non-Abelian braiding statistics.

Item Type: Journal Article
Publication: Nano Letters
Publisher: American Chemical Society
Additional Information: The copyright for this article belongs to the Author(s).
Keywords: Fabry-Perot interferometers; Graphene; Phase space methods; Quantum Hall effect; Quantum theory, Aharonov-Bohm interference; Bilayer Graphene; Experimental realizations; Fabry Perot interference; Fractional quantum Hall state; Quantum hall; Quantum hall interferometry; Triangular domains; Twisted bilayer graphene; Twisted bilayers, Interferometry
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 19 Sep 2022 08:42
Last Modified: 19 Sep 2022 08:42
URI: https://eprints.iisc.ac.in/id/eprint/76594

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