updown

The keyword "updown" is used in the context of spin-orbit coupling and noncollinear magnetism. It specifies that matrix elements between up- and down-components of the wave function spinor should be calculated. This is needed to generate for example the following matrices:

Matrix elements of the spin-orbit part of the Hamiltonian. (Specify "updown" together with "socmat") Matrix elements of the x- and y-components of the spin-operator. (Specify "updown" together with "mmn0") Matrix elements of the torque operator. (Specify "updown" together with "perpmag")