Directional shift current in mirror-symmetric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>BC</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">N</mml:mi></mml:mrow></mml:math>

Abstract

This work presents a theoretical study of the shift current in anoncentrosymmetric polytype of graphitic BC${}_{2}$N. The photoconductivitynear the fundamental gap is strongly anisotropic due to the vanishingof particular tensor components not foretold by point-group symmetryarguments; this is a consequence of dipole selection rules imposed bymirror symmetry, which imply that the relative parities betweenvalence and conduction bands are key for determining thedirectionality of the band-edge response.

Topics & Concepts