Quantum Hall interferometry in triangular domains of marginally twisted bilayer graphene

Abstract

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 $\theta$ $\approx$ $0.16$ ${}^{\circ }$. With the device operating in the QH regime, we observe distinct signatures of electronic Fabry-Pérot (FP) and Aharonov-Bohm (AhB)-oscillations of the magneto-thermopower in the density-magnetic field phase-space, at Landau level filling factors $\nu =4$,$8$. 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.

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• A primer on twistronics: A massless Dirac fermion's journey to moiré patterns and flat bands in twisted bilayer graphene
• Dissipation and dephasing in quantum Hall interferometers
• Arrays of one-dimensional conducting channels in minimally twisted bilayer graphene
• Structural and electronic signatures of strain-tunable marginally twisted bilayer graphene
• The fate of disorder in twisted bilayer graphene near the magic angle
• Effects of spin-orbit coupling in a valley chiral kagomé network