Noise due to neutral modes in the ν=2/3 fractional quantum Hall state

We theoretically study charge noise generated by excited neutral modes, which impinge on the quantum point contact of a quantum Hall bar with filling fraction $\ensuremath{\nu}=2/3$. The noise is computed for thermally excited neutral modes as well as for biased neutral modes with dipole-fermion excitations. Within the dipole-fermion picture, we show that the noise arising from two colliding modes can be suppressed due to Pauli blocking and be nonuniversal due to random edge disorder, but becomes universal upon disorder averaging. The ratio of noise due to two colliding neutral modes and noise due to only one such mode is smaller for dipole fermions than for thermal excitations, thus providing evidence for the different quantum statistics of the two types of excitations.