Parameter: Uc
Definition
Intra-orbital Coulomb interaction $U_c$.
Type
Float, double precision
Default value
4.0
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 meet the following relation:
\[\begin{equation} U_c = U_v - 2J_z \end{equation}\]
See also Uv, Jz parameters for more details.
For the AZALEA, GARDENIA, NARCISSUS, and DAISY components, the Coulomb interaction matrix can be imported via the solver.umat.in file which has the highest priority. See solver.umat.in for more details.