magnopy.SpinHamiltonian.p43#
property
- property SpinHamiltonian.p43#
Parameters of (four spins & three sites) term of the Hamiltonian.
\[\boldsymbol{J}_{4,3}(\boldsymbol{r}_{\nu,\alpha\beta}, \boldsymbol{r}_{\lambda,\alpha\gamma})\]of the term
\[\begin{split}C_{4,3} \sum_{\substack{\mu, \nu, \alpha, \beta,\\ i, j, u, v}} J^{ijuv}_{4,3}(\boldsymbol{r}_{\nu,\alpha\beta}, \boldsymbol{r}_{\lambda,\alpha\gamma}) S_{\mu,\alpha}^i S_{\mu,\alpha}^j S_{\mu+\nu,\beta}^u S_{\mu+\lambda, \gamma}^v\end{split}\]- Returns:
- parametersiterator
List of parameters. The list has a form of
[[alpha, beta, gamma, nu, lambda, J], ...]
where
alphais an index of the atom located in the (0,0,0) unit cell.betais an index of the atom located in the nu unit cell.gammais an index of the atom located in the lambda unit cell.nudefines the unit cell of the second atom (beta). It is a tuple of 3 integers.lambdadefines the unit cell of the third atom (gamma). It is a tuple of 3 integers.Jis a (3, 3, 3, 3) numpy.ndarray.