Super Poissonian noise in the FQHE regime

We present shot noise measurements in the fractional quantum Hall regime at View the MathML source when the fractional edges are weakly coupled by an artificial impurity, namely a quantum point contact. At low voltage, when the weak coupling is renormalized by the interaction and leads to strong backscattering, shot noise measurements show super Poissonian shot noise with a charge close to 2e or even above.