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We have investigated current-current correlations in a cross-shaped conductormade of graphene ribbons. We measured auto and cross correlations and comparedthem with the theoretical predictions for ideal diffusive conductors. Our datadeviate from these predictions and agreement can be obtained only by addingcontributions from occupation-number noise in the central region connecting thearms of the cross. Furthermore, we have determined Hanbury -- Brown and Twiss(HBT) exchange correlations in this system. Contrary to expectations for across-shaped diffusive system, we find finite HBT exchange effects due to theoccupation-number noise at the crossing. The strength of these HBT exchangecorrelations is found to vary with gate voltage, and very a distinct HBT effectwith large fluctuations is observed near the Dirac point.

Cross correlations in disordered, four-terminal graphene-ribbon conductor: Hanbury-Brown and Twiss exchange as a sign of non-universality of noise