Search found 5 matches

by nsherman
09 Jun 2021, 19:43
Forum: Algorithms
Topic: Question about iTDVP
Replies: 0
Views: 27

Question about iTDVP

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...
by nsherman
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...
by nsherman
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 ...
by nsherman
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...
by nsherman
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...