Elasticity and piezoelectricity of zinc oxide crystals, single layers, and possible single-walled nanotubes
Elasticity and piezoelectricity of zinc oxide crystals, single layers, and possible single-walled nanotubes
The elasticity and piezoelectricity of zinc oxide $(\mathrm{ZnO})$ crystals and single layers are investigated from the first-principles calculations. It is found that a $\mathrm{ZnO}$ thin film less than three $\mathrm{Zn}\text{\ensuremath{-}}\mathrm{O}$ layers prefers a planar graphitelike structure to the wurtzite structure. $\mathrm{ZnO}$ single layers are much more flexible than graphite single …