Physicists Measure e/4 Charge at ν=1/2 in GaAs Well, a First for Even-Denominator FQH States
burny_tech · x · 2026-09-23
A Physical Review Letters Editors' Suggestion reports the first shot-noise measurement of charge at an even-denominator fractional quantum Hall state: e/4 quasiparticles observed at filling factor ν=1/2 in a wide GaAs quantum well. Even-denominator FQHSs fall outside the Laughlin/Jain hierarchy and may host non-Abelian topological order, with potential applications in topological quantum computing. Work by Weizmann Institute, EPFL, and Princeton teams, published September 22, 2026.
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