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We present a theoretical study of the shift current in a noncentrosymmetricpolytype of graphitic BC$_2$N. We find that the photoconductivity near thefundamental gap is strongly anisotropic due to the vanishing of particulartensor components not foretold by point-group symmetry arguments; this is aconsequence of dipole selection rules imposed by mirror symmetry, which implythat the relative parities between valence and conduction bands are key fordetermining the directionality of the band-edge response. In addition, theband-edge photoconductivity turns out to be rather large, with the peak valueoccurring in an energy range suitable for optical manipulation

Directional shift current in mirror-symmetric BC$_2$N