## Search found 5 matches

09 Jun 2021, 19:43
Forum: Algorithms
Replies: 0
Views: 27

I'm trying to implement the infinite TDVP algorithm based on these notes https://arxiv.org/abs/1810.07006 It seems like these are the main steps: 1) Find the left and right environments 2) Use these to create effective Hamiltonians 0, and 1 site. 3) Integrate the TDVP equations to update the MPS ten...
04 May 2021, 00:55
Forum: HowTos and FAQ for TeNPy
Topic: Dynamics with Segment Boundary Conditions
Replies: 0
Views: 176

### Dynamics with Segment Boundary Conditions

I'm looking to study time-dependent two-point correlation functions following the prescription laid out in https://arxiv.org/abs/1207.0652 It seems like 'segment' boundary condition is what I'm looking for, but I'm confused on how to utilize this. What I want to do is use iDMRG to find the ground st...
28 Apr 2021, 00:48
Forum: HowTos and FAQ for TeNPy
Topic: Correlation function with infinite boundary conditions
Replies: 4
Views: 344

### Re: Correlation function with infinite boundary conditions

Great, I was thinking it's what I'm looking for. I have another possibly naive question. How do I actually use "segment"? I want to use infinite boundary conditions to find the ground state with DMRG, but then I want to transition to segment for the time evolution. So how would I go about ...
27 Apr 2021, 02:26
Forum: HowTos and FAQ for TeNPy
Topic: Correlation function with infinite boundary conditions
Replies: 4
Views: 344

### Re: Correlation function with infinite boundary conditions

I guess I forgot to mention explicitly that I want to study dynamics, so <Sz(x,t)Sz(0,0)> say. It seems like in order to time evolve Sz|psi>, I need to strictly work at finite system size, since the state is no longer translationally invariant. However, to eliminate boundary effects, one can use edg...
21 Apr 2021, 00:30
Forum: HowTos and FAQ for TeNPy
Topic: Correlation function with infinite boundary conditions
Replies: 4
Views: 344

### Correlation function with infinite boundary conditions

Hi, I'm new to TenPy, and I'm looking to compute correlation functions using infinite boundary conditions, based on this paper https://arxiv.org/abs/1207.0652 What I'm wondering is if this functionality is already baseline in TenPy? I'm thinking the 'segment' boundary condition might be what I'm loo...