Dear Mateusz Łącki,
On Apr 19, 2012, at 11:17 AM, Mateusz Łącki wrote:
Dear All, I am trying to define a new hamiltonian, but no matter what I do i get into "Did not find raising and lowering operators" error. I have tried various options and it seems that the only solution is to add a hopping term that couples neighbouring sites, but I would like not to do that as it is contrary to model which I consider.
This just means that the model you specified is not supported by the QMC codes. The QMC codes deal with models with hopping or exchange terms but are not general codes. If you send your model we'll be able to tell you if it can be simulated.
I have read that wang landau deals with low tunneling efficiently but what about no tuneling?BTW: If I increase the tunneling again will QWL be still efficient?
if there is no tunneling at all then the method is not ergodic and no reweighting will help that.
Matthias