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Title: Direct detection of fractional charge in zero-field fractional states
Plain: Quasiparticles in these fractional states should carry one third of an electron's charge, but in the zero-field states found since 2023 this has been inferred only indirectly.
Precise: In twisted MoTe2 or rhombohedral graphene FQAH states at $\nu = 2/3$ and $B = 0$, measure the quasiparticle charge $e*$ from the shot-noise Fano factor at a quantum point contact or from Fabry-Perot interference periods, and the braiding phase $2\pi/3$ by interferometry. An answer is $e*/e$ and the braiding phase with uncertainties.
Settled by: Shot-noise measurement giving $e* = e/3$ and an interferometer showing $2\pi/3$ phase slips at zero applied field.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: As of 2026 only the fractional Hall conductance has been measured (transport, Streda slopes $dn/dB$, optical signatures such as arXiv:2602.04561); quasiparticle charge has not been measured by shot noise or interferometry at $B = 0$, to this survey's knowledge.
Posed since: 2023