On 13 Jul 2007, at 04:46, armin.sauter@uni-ulm.de wrote:
Dirloop should not work on that model. I'll check this. Did you not get an error message?
No error messages.
I checked it. There is indeed no error message in sse or worms. We'll update this for the final release.
You should never set CONSERVED_QUANTUMNUMBERS=Sz for models that do not conserve Sz, such as your model.
Sx(i)*Sx(j) = 1/2*exchange_xy + 1/4*(Splus(i)*Splus(j)+Sminus(i)*Sminus(j))
The results for the energy are the same without the second term. Could there be an automatic restriction of the base?
Splus(i)*Splus(j) and similar terms are indeed not supported by the worm and sse algorithms, but the codes do not give error messages and just ignore them for now. We'll fix that.
Matthias