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{\it Ab initio} investigations of the full static dielectric response andBorn effective charge of BN nanotubes (BN-NTs) have been performed for thefirst time using finite electric field method. It is found that the ioniccontribution to the static dielectric response of BN-NTs is substantial andalso that a pronounced chirality-dependent oscillation is superimposed on theotherwise linear relation between the longitudinal electric polarizability andthe tube diameter ($D$), as for a thin dielectric cylinderical shell. Incontrast, the transverse dielectric response of the BN-NTs resemble thebehavior of a thin (non-ideal) conducting cylindrical shell of a diameter of$D+4$\AA$ $, with a screening factor of 2 for the inner electric field. Themedium principal component $Z_y^*$ of the Born effective charge correspondingto the transverse atomic displacement tangential to the BN-NT surface, has apronounced $D$-dependence (but independent of chirality), while the largelongitudinal component $Z_z^*$ exhibits a clear chirality dependence (butnearly $D$-independent), suggesting a powerful way to characterize the diameterand chirality of a BN-NT.Comment: submitted to PR

Static dielectric response and Born effective charge of BN nanotubes fromab initiofinite electric field calculations