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arXiv · 2008.11222

A tunable Fabry-P\'erot quantum Hall interferometer in graphene

Corentin Déprez·Louis Veyrat·Hadrien Vignaud·Goutham Nayak·Kenji Watanabe·Takashi Taniguchi·Frédéric Gay·Hermann Sellier·Benjamin Sacépé
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Abstract

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 $\mathbf{10 \,\mu m}$ 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.

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Corentin Déprez, Louis Veyrat, Hadrien Vignaud, Goutham Nayak, Kenji Watanabe, Takashi Taniguchi, Frédéric Gay, Hermann Sellier, Benjamin Sacépé. 2020-08-25. A tunable Fabry-P\'erot quantum Hall interferometer in graphene. https://doi.org/10.1038/s41565-021-00847-x

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