TeNPy Forum

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...

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

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 ...