Add to Calendar 2026-09-17T10:00:00 2026-09-17T11:00:00 Coherent bunching of anyons and their dissociation in interference experiments Event Information: Abstract: Aharonov–Bohm interference of fractional quasiparticles in the quantum Hall effect generally reveals their elementary charge (e*). Recently, our novel interferometry experiments found flux periods of ΔΦ = (e/e*)Φ0 (Φ0 the flux quantum) at moderate temperatures. More recent interference experiments of ‘particle–hole conjugated’ states (ν = 2/3, 3/5, and 4/7), revealed unexpected flux periodicities of ΔΦ = ν−1Φ0. Moreover, the measured Fano factor (F) of the partitioned quasiparticles (in the interferometer’s quantum point contacts) was found to be F = ν, instead of F = e*/e. These observations indicate that the interference (and F) suggest bunching (clustering) of the elementary quasiparticles, such as coherent pairs, triplets, and quadruplets, respectively. A small metallic gate (‘top-gate’), deposited in the center of the interferometer bulk, forms an antidot (or a dot) when charged, thus introducing ‘local quasiparticles’ at its perimeter in the bulk. Surprisingly, charging the dot led to an unexpected dissociation of the ‘bunched quasiparticles’, thus recovering the conventional flux periodicity set by the elementary charges. However, the Fano factors consistently remained as F = ν. The two observations—bunching and debunching (dissociation)—were not expected by current theories. Planned experiments with Jain’s ‘particle states’ and with ‘even denominator states’ are planned.Nature, 642, 922-927 (2025)Nature Physics, 21, 1392-1397 (2025) Event Location: Brimacombe Building (BRIM) 2355 East Mall, Room 311