Dear ALPS friends,
I'm trying to generate Hamiltonian matrix elements for lattice models using
the kitchen sink of symmetries in ALPS. Unfortunately, I can't figure out
where I can get them by reading the source code.
Specifically, I'm looking for the quantity M(i,j,k,l) which defines the
Hamiltonian H = sum(i,j,k,l) M(i,j,k,l) c(i)+ c(j)+ c(l) c(k). I doubt it
is ever stored complete in memory, but I just want to read it out
element-by-element in sparse format into an external file. If no part of
this quantity ever exists but can be obtained by some modifying the code,
that works, too.
If someone can point me to the right place and make a suggestion for what to
do, that would be fantastic. If this is not a simple request at all, but
someone still wants to help me, I can give a much more detailed explanation
of what I'm trying to do.
Jeff Hammond
The University of Chicago