Hi,

I am manually writing a correlation function for Fermions (that is, not using AutoMPO).

In order to include the Jordan-Wigner string, will I need to use bosonic operators (i.e. A and A^dag) instead of fermionic operators (C and C^dag), along with Jordan-wigner string operators, F?

Or, do I write the correlation function in terms of C operators along with F operators? That is, since the MPS that this correlation function acts on is for spinful fermions, I must use C operators, and then also need F operators because they don't automatically include the F operators?

Sorry if this has been covered before, but this is a point of significant confusion for me.

Jon

By the way, there is the Code Formula about this which you and I had worked on before. It only covers the spinless case but I believe it's correct for that case:

http://itensor.org/docs.cgi?page=formulas/spinless_correlator_mps

We should work on a second one, or an extra section on this page, for the case of fermions with spin.