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.
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?
The model and parameter files are attached. The 'chain lattice' is from the standard lattice library.
In the current svn version this model now works correctly for the sse and worm codes - by giving an error message and aborting the simulation. Adrian is checking the DMRG code.
Matthias