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Based on the investigation of the multi-terminal conductance of a systemcomposed of two graphene nanoribbons, in which one is on top of the other androtated by 60 degrees, we propose a setup for a 50/50 electronic beam splitterthat neither requires large magnetic fields nor ultra low temperatures. Ourfindings are based on an atomistic tight-binding description of the system andon the Green's function method to compute the Landauer conductance. Wedemonstrate that this system acts as a perfect 50/50 electronic beam splitter,in which its operation can be switched on and off by varying the doping (Fermienergy). We show that this device is robust against thermal fluctuations andlong range disorder, as zigzag valley chiral states of the nanoribbons areprotected against backscattering. We suggest that the proposed device can beapplied as the fundamental element of the Hong-Ou-Mandel interferometer, aswell as a building block of many devices in electron optics.

A 50/50 electronic beam splitter in graphene nanoribbons as a building block for electron optics