Search found 4 matches

by nnit
28 May 2024, 10:24
Forum: HowTos and FAQ for TeNPy
Topic: Purification for Finite Temperature Simulations
Replies: 2
Views: 14152

Re: Purification for Finite Temperature Simulations

Thank you very much for your quick reply and your explanations. Regarding point 3, Yes I had something different in mind. If now I understand correctly, the chi_list option acts over the entire loop of temperatures, and I can change the bond dimension after a certain number of dt steps. Is my unders...
by nnit
22 May 2024, 14:56
Forum: HowTos and FAQ for TeNPy
Topic: Purification for Finite Temperature Simulations
Replies: 2
Views: 14152

Purification for Finite Temperature Simulations

Hi everyone, I am currently working on finite temperature simulations using the purification approach in TeNPy. I have tried both the applyMPO and TEBD algorithms to perform imaginary time evolution on a purified MPS and I have some questions. 1) I didn't quite get the following line in 'II'-order a...
by nnit
22 May 2023, 20:25
Forum: HowTos and FAQ for TeNPy
Topic: exponential of the sum of operators on different sites
Replies: 3
Views: 14743

Re: exponential of the sum of operators on different sites

Hi Johannes, I think that the result is wrong by making a comparison with this article: https://doi.org/10.1103/PhysRevLett.118.157602 In this case they are using GFMC to simulate a system of one or more chains and calculate the quantity described above. In my case it seems to me that I continue to ...
by nnit
18 May 2023, 09:03
Forum: HowTos and FAQ for TeNPy
Topic: exponential of the sum of operators on different sites
Replies: 3
Views: 14743

exponential of the sum of operators on different sites

Hello, I'm trying to calculate the expectation value of the charge parity operator. I'm working with the Bose-Hubbard model and in 1D I'm able to correctly compute the expectation value of the operator O(r) = \prod_{i=0}^{r-1} \exp(i\pi(n_{i}-1)) as product of single site operators. The problem aris...