Thank you. I have indeed overlooked this important parameter.
It now works smoothly with spinless fermions or bosons. However for spinful fermions the time it takes is more than a thousand times (or more) longer. Even for tiny 2D systems the time it takes is huge. Is it a known limitation and is there a physical reason?
On Sat, Jul 8, 2017 at 2:48 AM, Michele Dolfi dolfim@phys.ethz.ch wrote:
Note that by default mps_evolve only works for nearest neighbors lattices. In higher dimensions this is not the case, since the lattice is unrolled into a one dimensional chain with longer range interactions.
We have a second flavor of the time evolution algorithm for these cases, you can use it via the parameter: te_type=mpo Quite some improvements to this variant was introduced in ALPS 2.3, so I suggest you to use that version.
Best, Michele