[ALPS-users] Two-dimensional system with MPS

[H]

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 at 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
>
>
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