Re: [ALPS-users] Transverse Ising-Model
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. thanks Armin
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
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
The bug is fixed in thew 1.3b6 release Matthias 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.
thanks Armin
<spinmodels.xml> <dirloop.xml> <dmrg.xml>
participants (2)
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armin.sauter＠uni-ulm.de
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Matthias Troyer