magnopy.SpinHamiltonian.remove_44#
method
- SpinHamiltonian.remove_44(alpha: int, beta: int, gamma: int, epsilon: int, nu: tuple, _lambda: tuple, rho: tuple) None#
Removes a (four spins & four sites) parameter from the Hamiltonian.
Duplicates of the bonds are managed automatically (independently of the convention of the Hamiltonian).
- Parameters:
- alphaint
Index of an atom from the (0, 0, 0) unit cell.
0 <= alpha < len(spinham.atoms.names).- betaint
Index of an atom from the nu unit cell.
0 <= beta < len(spinham.atoms.names).- gammaint
Index of an atom from the _lambda unit cell.
0 <= gamma < len(spinham.atoms.names).- epsilonint
Index of an atom from the rho unit cell.
0 <= epsilon < len(spinham.atoms.names).- nutuple of 3 int
Three relative coordinates with respect to the three lattice vectors, that specify the unit cell for the second atom.
\[\nu = (x_{\boldsymbol{a}_1}, x_{\boldsymbol{a}_2}, x_{\boldsymbol{a}_3})\]- _lambdatuple of 3 int
Three relative coordinates with respect to the three lattice vectors, that specify the unit cell for the third atom.
\[\lambda = (x_{\boldsymbol{a}_1}, x_{\boldsymbol{a}_2}, x_{\boldsymbol{a}_3})\]- rhotuple of 3 int
Three relative coordinates with respect to the three lattice vectors, that specify the unit cell for the fourth atom.
\[\rho = (x_{\boldsymbol{a}_1}, x_{\boldsymbol{a}_2}, x_{\boldsymbol{a}_3})\]
Notes
If
spinham.convention.multiple_countingisTrue, then this function removes all versions of the bond from the Hamiltonian.If
spinham.convention.multiple_countingisFalse, then this function removes the primary version of the given bond.For the definition of the primary version see Multiple counting.