On July 16, 2015 the first experimental observations of Weyl fermion semimetal and topological Fermi arcs in an inversion symmetry-breaking single crystal material tantalum arsenide ( TaAs ) were made
12.
A similar effect, known as the Dresselhaus spin orbit coupling arises in cubic crystals of A _ 3 B _ 5 type lacking inversion symmetry and in quantum wells manufactured from them.
13.
For materials exhibiting a non-negligible Kerr effect, the third, ? ( 3 ) term is significant, with the even-order terms typically dropping out due to inversion symmetry of the Kerr medium.
14.
The SiV has an inversion symmetry, and no static electric dipole moment ( to the first order ); it is therefore insensitive to the Stark shift that could result from inhomogeneous electric fields within the diamond lattice.
15.
This is the Thomas-Reiche-Kuhn sum rule, and the term with k = n has been omitted because in confined systems such as atoms or molecules the diagonal matrix element \ langle n | p _ x | n \ rangle = 0 due to the time inversion symmetry of the Hamiltonian H.
16.
This plate has a pattern of tiny opaque patches which are arranged on the plate with inversion symmetry but which are otherwise random in shape and distribution . ( 1 ) A certain fraction of the light passes directly through the scatterplate, is reflected by the mirror, but then is scattered as it encounters the scatterplate for the second time.
17.
The following space groups have inversion symmetry : the triclinic space group 2, the monoclinic 10-15, the orthorhombic 47-74, the tetragonal 83-88 and 123-142, the trigonal 147, 148 and 162-167, the hexagonal 175, 176 and 191-194, the cubic 200-206 and 221-230.
