(3, 3) terms#
Third type of the trilinear terms, in which all three spin operators are associated with different sites. In this page we imply that \(\boldsymbol{r}_{\mu,\alpha_1}\), \(\boldsymbol{r}_{\mu + \nu_2, \alpha_2}\), and \(\boldsymbol{r}_{\mu + \nu_3, \alpha_3}\) are all different.
\[\begin{split}C_{3, 3}
\sum_{\substack{\mu, \nu_2, \nu_3 \\ \alpha_1, \alpha_2, \alpha_3 \\ i_1, i_2, i_3}}
J^{i_1, i_2, i_3}_{\nu_2,\nu_3; \alpha_1,\alpha_2,\alpha_3}
S_{\mu, \alpha_1}^{i_1}
S_{\mu + \nu_2, \alpha_2}^{i_2}
S_{\mu + \nu_3, \alpha_3}^{i_3}\end{split}\]
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.