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The relativistic nature of charge carriers in graphene is expected to lead toan angle- dependent transmission through a potential barrier, where Kleintunneling involves annihilation of an electron and a hole at the edges of thebarrier. The signatures of Klein tunneling have been observed in gated graphenedevices, but the angle dependence of the transmission probability has not beendirectly observed. Here we show measurements of the angle-dependenttransmission through quasi-ballistic graphene heterojunctions with straight andangled leads, in which the barrier height is controlled by a shared gateelectrode. Using a balanced differential measurement technique, we isolate theangle-dependent contribution to the resistance from other angle-insensitive,gate-dependent and device-dependent effects. We find large oscillations in thetransmission as a function of the barrier height in the case of Klein tunnelingat a 45 deg angle, as compared to normal incidence. Our results are consistentwith the model that predicts oscillations of the transmission probability dueto interference of chiral carriers in a ballistic barrier. The observed angledependence is the key element behind focusing of electrons and the realizationof a Veselago lens in graphene.

Observation of angle-dependent transmission of Dirac electrons in graphene hetero junctions