Hanbury Brown and Twiss-type experiment with electrons

Fermion anti-bunching was directly observed by measuring the cross-covarian ce of the current fluctuations of partitioned electrons. A quantum paint co ntact was used to inject single-mode electrons into a mesoscopic electron b eam splitter device. The beam splitter output currents showed negative cros s-covariance, indicating that the electrons arrived individually at the bea m splitter and were randomly partitioned into two output channels. As the r elative time delay between the outputs was changed, the observed ringing in the cross-covariance was consistent with the bandwidths used to monitor th e fluctuations. The result demonstrates a fermion complement to the Hanbury Brown and Twiss experiment for photons.