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Directional shift current in mirror-symmetric BC₂N

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arxiv 1906.07627 v2 pith:T7JX6JQC submitted 2019-06-18 cond-mat.mes-hall

Directional shift current in mirror-symmetric BC₂N

classification cond-mat.mes-hall
keywords band-edgecurrentphotoconductivityshiftsymmetryadditionanisotropicarguments
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We present a theoretical study of the shift current in a noncentrosymmetric polytype of graphitic BC$_2$N. We find that the photoconductivity near the fundamental gap is strongly anisotropic due to the vanishing of particular tensor components not foretold by point-group symmetry arguments; this is a consequence of dipole selection rules imposed by mirror symmetry, which imply that the relative parities between valence and conduction bands are key for determining the directionality of the band-edge response. In addition, the band-edge photoconductivity turns out to be rather large, with the peak value occurring in an energy range suitable for optical manipulation

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