Strain-induced giant enhancement of anisotropic dielectric constant in layered nitrides SrHfN 2 and SrZrN 2

The dielectric constants of layered nitrides SrHfN 2 and SrZrN 2 are dramatically enhanced to maximum values of ∼2600 and 2700 under isotropic tensile strain, which provides an effective route to regulate the anisotropic dielectric constants.