Spectral noise for edge states at the filling factor

We present a detailed analysis of finite-frequency noise for the ν = 5/2 fractional quantum Hall state in a quantum point contact geometry. The results were obtained within the Pfaffian and anti-Pfaffian models. We show that the behaviour of the coloured noise allows us to unambiguously discriminate among tunnelling excitations with different charges. Optimal values of the external bias are found in order to emphasize the visibility of the noise peak associated with the tunnelling of a 2-agglomerate, namely an excitation with charge that is double the fundamental one. These correspond to the regime in which the bias is larger than the neutral modes cut-off frequency. The dependence on temperature is also investigated to discriminate between the considered models. 5 Author to whom any correspondence should be addressed. New Journal of Physics 14 (2012) 023017 1367-2630/12/023017+13$33.00 © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft