lello

Hi, I am wondering if OMPS alows to add two generic MPOs and truncate/approximate the result to a new MPO using a rounding procedure (based for example of SVD decompositions of the cores) in order to reduce the bond dimensions. thanks Raffaele

Hi, the main problem I am facing at the moment is how to define a copuling operator between the first site and all the other sites. Due to lack of symmetries of such a model I think it should be possible to use the rule "ProductTerm" to construct very general exciton-boson MPOs and then add all of them toghether. However, I don't understand how OMPS performs the summation of MPO operators. Is it possible to perform addition and truncation of operators using SVD to keep bond dimensions at a reasonable...

Hi, thanks for the reply, I managed to compile the code with intel fortran. R

Hi, I just started to use the OMPS package but I cannot understant how to write an exciton-boson Hamiltonian, or if it is possible at all. The Hamiltonian is technically comprised of a first site with and arbitrary (Hermitian) Hamiltonian H_e and additional boson sites interacting with the first site. The formal structure of the Hamiltonian would be H = ∑{n,m} H |n>< m| + ∑k ω_k n_k − ∑ |n><n|g_{nk} (b_k + b_k) In the above expression the parameters H_{nm} define the exction part and should be arbitrary,...

Compile with Intel fortran and MKL