(4, 1) terms#
First type of the quadlinear terms, in which all four spin operators are associated with the same site.
\[\begin{split}C_{4, 1}
\sum_{\substack{\mu, \\ \alpha_1, \\ i_1, i_2, i_3, i_4}}
J^{i_1, i_2, i_3, i_4}_{0, 0, 0; \alpha_1, \alpha_1, \alpha_1, \alpha_1}
S_{\mu, \alpha_1}^{i_1}
S_{\mu, \alpha_1}^{i_2}
S_{\mu, \alpha_1}^{i_3}
S_{\mu, \alpha_1}^{i_4}\end{split}\]
Relevant API#
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Convention constant.
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Method to add the parameter to the Hamiltonian.
magnopy.SpinHamiltonian.remove()Method to remove the parameter from the Hamiltonian.
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An iterator over the parameters already added to the Hamiltonian.