Transverse Piezo- and Pyroelectric Effects in 2D Nanoallotropes of Boron Nitride Caused by the Ripple Formation

The ripple formation in the structure of 2D allotropes of boron nitride is shown to lead to the appearance in them of the transverse piezo- and pyroelectric effects with coefficients depending on temperature. These coefficients are calculated for various 2D allotropes of boron nitride. It is shown that due to a small ripple height the transverse piezoeffect in these nanoallotropes is three order of magnitude weaker than the longitudinal effect, whereas the pyroelectric effect is quite comparable with analogous effect in fluorographane and can find a practical application.