Search found 32 matches
- 23 Mar 2021, 19:16
- Forum: HowTos and FAQ for TeNPy
- Topic: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
- Replies: 15
- Views: 10493
Re: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
Thank you very much for the answer. I calculated the time evolution for a t that provides me with a sufficient frequency resolution (for first tests in any case). However, I’m still concerned with the technicality that I mentioned above that I get the Error ‘incompatible leg charge’ when I want to c...
- 23 Mar 2021, 12:47
- Forum: HowTos and FAQ for TeNPy
- Topic: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
- Replies: 15
- Views: 10493
Re: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
So I guess the problem is that the maximal bond dimensions of the iDMRG ground state psi_0, and the time evolved ground state psi are different. I passed the same chi_max to both algorithms, but since psi_0 is closer to a product state it doesn't need a very high chi. Is there a way to 'grow' psi_0 ...
- 15 Mar 2021, 11:40
- Forum: HowTos and FAQ for TeNPy
- Topic: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
- Replies: 15
- Views: 10493
Re: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
Quick Follow-up question: So I guess the code to obtain the structure factor C^zz_ij could look something like this (already having calculated the iDMRG ground state psi_0): C_ij = [] for site in range(num_sites): # apply the first operator to the ground state psi = psi_0.copy() psi.apply_local_op(s...
- 12 Mar 2021, 09:45
- Forum: HowTos and FAQ for TeNPy
- Topic: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
- Replies: 15
- Views: 10493
Re: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
I see, thanks for your help!
Best regards!
Best regards!
- 12 Mar 2021, 00:16
- Forum: HowTos and FAQ for TeNPy
- Topic: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
- Replies: 15
- Views: 10493
Re: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
Thanks a lot. I was a little overwhelmed with the many possibilities, but I settled on trying out ExpMPOEvolution.
In the last step, why should I use mpsenvironment.expectation_value instead of the mps.method?
In the last step, why should I use mpsenvironment.expectation_value instead of the mps.method?
- 09 Mar 2021, 13:49
- Forum: HowTos and FAQ for TeNPy
- Topic: Fourier Transform Product state
- Replies: 1
- Views: 1985
Fourier Transform Product state
Within some approximation a system has the ground state |\tilde{\psi}_0 \rangle and an excited state |\tilde{\psi}_1 \rangle = \hat{O}|\tilde{\psi}_0 \rangle that is connected via the operator \hat{O} , which is known. I now did a DMRG calculation for that system, obtaining the real ground state |\p...
- 16 Feb 2021, 17:12
- Forum: HowTos and FAQ for TeNPy
- Topic: Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
- Replies: 15
- Views: 10493
Dynamical spin Structure Factor/ Excitation Spectrum of Spin Ladder
Hello, I would like to calculate the Dynamical Spin Structure and/or the Excitation spectrum of the 2 chain spin ladder, which I implemented below.Ultimately, I would like to compare the results to Neutron Scattering experiments. Using the ladder lattice of TenPy I constructed the model: class spinL...