The wurtzite structure is non-centrosymmetric ( i . e ., lacks inversion symmetry ).
4.
Another meaning of " center of symmetry " is a point with respect to which inversion symmetry applies.
5.
In media that lack inversion symmetry, the Kerr effect is generally masked by the much stronger Pockels effect.
6.
Every type has order 2 C i central inversion symmetry in general, but each has higher symmetry geometries as well.
7.
Due to CPT-symmetry, violation of CP-symmetry demands violation of time inversion symmetry, or T-symmetry.
8.
It should be noted that this structure lacks a horizontal mirror plane and thus inversion symmetry, which is essential to realize Weyl semimetal.
9.
Hexagonal and zincblende polymorphs have no inversion symmetry ( reflection of a crystal relative to any given point does not transform it into itself ).
10.
Then mirror-image symmetry is equivalent to inversion symmetry; in such contexts in modern physics the term parity or P-symmetry is used for both.
