Using TDVP for non hermitian Hamiltonians

ITensor Julia Questions
1

Hi,

Just a quick question. Does TDVP currently work for non-Hermitian Hamiltonians?

Thanks!

2 Likes
2

I’ve been using it for this purpose. If it doesn’t work that’s news to me!

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3

Hi Corbett, would you be able to provide some code showing this working? I have been trying but it doesn’t seem to give me any valid answers.

4

Are you passing the ishermitian and issymmetric key word arguments to tdvp? That is all that should be required

 updater_kwargs = Dict(:ishermitian => false, :issymmetric => false)
 psi = tdvp(H, t, psi; updater_kwargs)
5

Yes, even with this I still get divergent observables.

6

Maybe the non-Hermitian nature isn’t the problem then. Perhaps tdvp isn’t able to do the evolution you want it to. have you tried using ITensorTDVP.expand?