TeNPy Forum

Thanks! Another thing, now I am trying to calculate the spectrum function, for which I need to do tebd on the ladder model. However, it raises error when I try to calculate H_bond. When I try to get H_bond with calc_H_bond(), it says ------------------------------------------------------------------...

The Hamiltonian is

\(H_tot=-t \sum_i (c_i^\dagger c_{i+1} +h.c.) - h \sum_i (\chi_i^\dagger \chi_{i+1}+h.c.) +V\sum_i n_{c,i} n_{c,i+1} + g \sum_i n_{c,i} n_{x,i}\)

Hello. I am working with an impurity-electron model on a ladder. The Hamiltonian is H_tot=-t \sum_i (c_i^\dagger c_{i+1} +h.c.) - h \sum_i (\chi_i^\dagger \chi_{i+1}+h.c.) +V\sum_i n_{c,i} n_{c,i+1} + g \sum_i n_{c,i} n_{x,i} where C is annihilator of a host Fermion and \chi that of an impority. To ...

Hi, it seems that this problem only appear at the first site (or the first two sites for ladder). That is, for example, if I am working with a ladder with length of 10, then the problem will arise at site 0 and up to now for i>1 the function MPS.apply_local_op(i,op) works well.

What I want to calculate is \(\langle GS|C_p H C_p^\dagger |GS \rangle \). I planed to apply Cd on each site and sum them up with some phase factors to construct \(C_p^\dagger GS \rangle \) and calculate the expectation of \(H\) for this state.

After attaining the ground state I tried to apply C^\dagger_p on it to calculate the energy spectrum. To do so I need to apply Cd to every sites and times the result with some phase factor. However, I was met with a error saying "s has wrong shape: (1,) instead of 0" (shown below). The cod...

All of plus_hc are set to be True since tenpy always raises TypeError once it is False. TypeError Traceback (most recent call last) <ipython-input-5-73d291e71b76> in <module>() 18 } 19 ---> 20 TestModel=GroupedBosonImpModel(test_params) 3 frames /usr/local/lib/python3.7/dist-packages/tenpy/models/mo...

Hello, I am trying to find the ground state and calculate the ground state energy of a spinless fermi system using GroupedSite and DMRG. However, the problem is that I need the number of impurity to be fixed, while actually it always change and finally DMRG always give me the global minimum with ano...