Hi,
I'm trying to decrease the number of terms appearing in the Hamiltonian MPO by using H. c. in add_coupling_term. However, when I use plus_hc I always get an error. I have tried this with different models, and I get the same error. I provide an example below.
I have a ladder of SpinHalfFermions on a Chain lattice with the following hopping coupling terms:
self.add_local_term(-adj_mat[i, j], [('Cdu', (i, 0)), ('Cu', (j, 0))])
self.add_local_term(adj_mat[i, j], [('Cu', (i, 0)), ('Cdu', (j, 0))])
self.add_local_term(-adj_mat[i, j], [('Cdd', (i, 0)), ('Cd', (j, 0))])
self.add_local_term(adj_mat[i, j], [('Cd', (i, 0)), ('Cdd', (j, 0))])
This case works without any problem. However, when I change to:
self.add_local_term(-adj_mat[i, j], [('Cdu', (i, 0)), ('Cu', (j, 0))],plus_hc=True)
self.add_local_term(adj_mat[i, j], [('Cd', (i, 0)), ('Cdd', (j, 0))],plus_hc=True)
I receive the error:
IndexError: tuple index out of range
Am I doing something wrong?
F. P. M. Méndez-Cordoba.
Problems with add_local_term and H.c
Re: Problems with add_local_term and H.c
This case wasn't tested properly, so a bug could sneak in...
I've just fixed it in 72f79cce1f7dd04607027322763db2a6b80466e3 and added proper tests.
The index error indicates that you didn't actually set the option
You need to do that as well to actually save MPO bond dimension.
PS: for the future, questions like this should probably go into the HowTo section...
I've just fixed it in 72f79cce1f7dd04607027322763db2a6b80466e3 and added proper tests.
The index error indicates that you didn't actually set the option
explicit_plus_hc=True, otherwise it would not have occured...You need to do that as well to actually save MPO bond dimension.
PS: for the future, questions like this should probably go into the HowTo section...