Aharonov–Bohm interference in bilayer graphene reveals history‑aware anyons

In this work, ultraclean bilayer graphene is tuned into an even‑denominator fractional quantum Hall state, where strongly interacting electrons in a two‑dimensional carbon lattice fractionalize into anyons with unusual charge and statistics. The device geometry forces an anyonic excitation to travel along a loop around an island containing other anyons and magnetic flux, so that Aharonov–Bohm interference in the encircling wave function shows up directly as oscillations between high and low electrical resistance.

Researchers from Israel’s Weizmann Institute of Science and Japan’s National Institute for Materials Science have reported an Aharonov–Bohm interferometer in bilayer graphene, using it to reveal non-Abelian anyons whose collective quantum state can remember the history of their exchanges – a crucial resource for topological quantum computing.In this work, ultraclean bilayer graphene is tuned into an even‑denominator fractional quantum Hall state, where strongly interacting electrons in a two‑dimensional carbon lattice fractionalize into anyons with unusual charge and statistics. The device geometry forces an anyonic excitation to travel along a loop around an island containing other anyons and magnetic flux, so that Aharonov–Bohm interference in the encircling wave function shows up directly as oscillations between high and low electrical resistance.

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