TeNPy Forum

Yes, true. That is why I first do the projection and have few-body terms where I use multi_coupling_terms to implement the Hamiltonian. Just curiosity, how would we implement it naively? How would we implement this sort of product terms given in my original post?

How can we add terms like \(O_k=\Pi_{<i,j>} (1-n_i n_j)B_k \quad i,j \neq k\) to Hamitonian ?

Basically, I am trying to find the boundaries delimiting the first two Mott lobes by calculating the single-particle excitation gap. I do not really get how I should fix the lattice size and vary the particle numbers (N,N+1,N-1) such that I can calculate the quantity, \Delta = \mu^+ - \mu^-, \quad\m...

Thank you, for the time being, I indeed call the add_exponentially_decaying_coupling() several times

Basically what I am trying to do is that I want to have a dimerized lattice (having a 1D lattice with alternating lattice spacing, (say a,2a,a,2a ...). I can achieve this by modifying the coupling between sites by using a unit cell with two sites. However, I would like to also have a long-range inte...

Thank you very much. After posting the question I actually wrote my own routine and I just wanted to make a comparison.

Bear in mind that I just started learning about MPS and DMRG, hence this might be a stupid question. Is it possible to obtain the state vector representation of a quantum state provided that we have the MPS representation? Basically, can we convert a given MPS ground state to the linear superpositio...

Thank you very much for your help. It was indeed about BLAS and I think there were some clashes with MKL during the run as well. I created a separate env for tenpy from scratch, everything works as expected.

I used conda to install TenPy, I will try your suggestion.

Hi everyone, for some reason, I have been having a weird problem with my setup where I receive the following error, Process finished with exit code 139 (interrupted by signal 11: SIGSEGV),whenever I try to calculate <Sy> or <Sy_iSy_j> . Minimal example can be found below, basically the XXZ chain tut...