triqs.operators.util.U_matrix.clebsch_gordan
- triqs.operators.util.U_matrix.clebsch_gordan(jm1, jm2, jm3)[source]
Calculate the Clebsch-Gordan coefficient.
\[\begin{split}\langle j_1 m_1 j_2 m_2 | j_3 m_3 \rangle = (-1)^{j_1-j_2+m_3} \sqrt{2 j_3 + 1} \begin{pmatrix} j_1 & j_2 & j_3\\ m_1 & m_2 & -m_3 \end{pmatrix}.\end{split}\]- Parameters:
- jm1tuple of int
\((j_1, m_1)\).
- jm2tuple of int
\((j_2, m_2)\).
- jm3tuple of int
\((j_3, m_3)\).
- Returns:
- float
Value of the Clebsch-Gordan coefficient.