Parameter: Jz

Definition

Coupling constant for the Hund's exchange interaction in z axis, $J_z$.

Type:

Float, double precision

Default value

0.0

Component

ALL

Behavior

It is used to determine the Coulomb interaction matrix.

Comment

Actually, only the AZALEA, GARDENIA, NARCISSUS, and DAISY components need it. For the other quantum impurity solvers components (i.e., the CAMELLIA, BEGONIA, LAVENDER, MANJUSHAKA and PANSY components), the information about the Coulomb interaction matrix is imported via the atom.cix file. So you can set it to any values for the latter five components.

Usually, the $U_c$, $U_v$ and $J_z$ should satisfy the following relation:

\[\begin{equation} U_c = U_v - 2J_z \end{equation}\]

See also Uc, Uv parameters for more details.

Usually, $J_z = J_s = J_p = J$. As for a single-band model, they are zero. See also Js, Jp parameters for more details.