Electron interferometry with quantum Hall edge channels holds promise for probing and harnessing exotic exchange statistics of non-Abelian anyons. In semiconductor heterostructures, however, quantum Hall interferometry has proven challenging and often obscured by charging effects. Here we show that high-mobility monolayer graphene equipped with a series of gate-tunable quantum point contacts that act as electron beam-splitters provides a model system to perform Fabry-P\'{e}rot quantum Hall interferometry. We observe high-visibility Aharonov-Bohm interference free of charging effects and widely tunable through electrostatic gating or magnetic field, in remarkable agreement with theory. A coherence length of 10μm at a temperature of 0.02 K allows us to further achieve coherently-coupled double Fabry-P\'{e}rot interferometry. Our results open a new avenue for quantum Hall interferometry and the exploitation of topological excitations for quantum computation.
@article{arxiv.2008.11222,
title = {A tunable Fabry-P\'erot quantum Hall interferometer in graphene},
author = {Corentin Déprez and Louis Veyrat and Hadrien Vignaud and Goutham Nayak and Kenji Watanabe and Takashi Taniguchi and Frédéric Gay and Hermann Sellier and Benjamin Sacépé},
journal= {arXiv preprint arXiv:2008.11222},
year = {2021}
}