Search found 3 matches
- 10 Oct 2021, 05:22
- Forum: HowTos and FAQ for TeNPy
- Topic: spin inversion & reflection symmetry
- Replies: 1
- Views: 3841
spin inversion & reflection symmetry
Hello, 1) I want to compute ground states of the finite-size TF Ising model via DMRG for transverse fields g_x<1 . However, I always want to get the ground state that is spin-flip symmetric. For example, when setting g_x=0 , I want to get the GHZ state: 1/\sqrt{2}(|0...0\rangle + |1...1\rangle|) rat...
- 05 Feb 2021, 07:41
- Forum: HowTos and FAQ for TeNPy
- Topic: DMRG with fixed bond dimension
- Replies: 2
- Views: 2062
Re: DMRG with fixed bond dimension
Thanks Johannes!
In the end these truncation parameters did the job for me: 'trunc_params': {'chi_max': 40, 'svd_min': None, 'trunc_cut': 0}
(setting svd_min to zero returned a warning in my case since its logarithm is calculated somewhere.)
Best,
Rike
- 06 Jan 2021, 04:51
- Forum: HowTos and FAQ for TeNPy
- Topic: DMRG with fixed bond dimension
- Replies: 2
- Views: 2062
DMRG with fixed bond dimension
Hello, I was wondering if there is an easy way to force the bond dimensions of a finite MPS (obtained via DMRG) to always be maximal up to some chi_max, e.g.: chi = [2, 4, 8, 16, 32, 40, 40, …, 40, 40, 32, 16, 8, 4, 2] for spin-1/2 and chi_max = 40. I played around with chi_min, but it doesn’t seem ...