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    Evidence for non-linear quasiparticle tunneling between fractional quantum Hall edges

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    Remarkable nonlinearities in the differential tunneling conductance between fractional quantum Hall edge states at a constriction are observed in the weak-backscattering regime. In the ν\nu = 1/3 state a peak develops as temperature is increased and its width is determined by the fractional charge. In the range 2/3≤ν≤1/32/3 \le \nu \le 1/3 this width displays a symmetric behavior around ν\nu = 1/2. We discuss the consistency of these results with available theoretical predictions for inter-edge quasiparticle tunneling in the weak-backscattering regime
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