  The point group symmetry of materials is closely related to their physical
properties and quite important for material modeling. However, superlattice
materials have more complex symmetry conditions than crystals due to their
multilevel structural feature. Thus, a theoretical framework is proposed to
characterize and determine the point group symmetry of nonmagnetic superlattice
materials systematically. A variety of examples are presented to show the
symmetry features of superlattice materials in different dimensions and scales.
In addition, the deformation induced symmetry breaking phenomenon is also
studied for superlattice materials, which has potential application in tuning
physical properties by imposing a strain field.
