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We experimentally investigate interference effects in transport across asingle incompressible strip at the edge of the quantum Hall system by using aFabry-Perot type interferometer. We find the interference oscillations intransport across the incompressible strips with local filling factors $\nu_c=1,4/3, 2/3$ even at high imbalances, exceeding the spectral gaps. In contrast,there is no sign of the interference in transport across the principal Laughlin$\nu_c=1/3$ incompressible strip. This indicates, that even at fractional$\nu_c$, the interference effects are caused by "normal" electrons. Theoscillation's period is determined by the effective interferometer area, whichis sensitive to the filling factors because of screening effects.

Interference effects in transport across a single incompressible strip at the edge of the fractional quantum Hall system