Dear ALPS team,
I have successfully performed a full diagonalization for a Hubbard chain
with periodic boundary conditions using the included models in xml files.
Now, I'd like to perform the same task with antiperiodic boundary
conditions (a fermionic hopping with opposite sign) at chain ends, or more
generally with exponetial complex phase, possibly by using again the xml
input schema. Can you give me some hint ? Is it also possible to specify
the hamiltonian or any other operator in a more extended form, with the
site indices explicitly defined in the expression, as one would do with
Mathematica, such as for instance
-t#*fermion_hop(1,2) + t#*fermion_hop(3,4) + ... and so on ?
Thank you for your support
Best regards
Jessica Alfonsi