Many thanks for both answers. It was actually not clear to me how to extract the degeneracy of each sector ....
Another question then : when I have a sector (Sz,k) with degeneracy 3, what is the exact meaning of the correlations S+(i)S-(j) on this sector ? More precisely, how do the 3 states contribute to the correlations ?
Thanks again.
Jean-David
On 09/02/2010 04:19 PM, Matthias Troyer wrote:
Hi Jean-David,
You wrote an extra= in
'MEASURE_CORRELATIONS[Diagonal spin correlations]=' : 'Sz'
That means that this does not match the pattern for a correlation definition
Matthias
On 2 Sep 2010, at 16:34, Jean-David Picon wrote:
Sorry,
Here is the python script I used to make the ED. By the way, as you can see, I also ask in the script for the Jz(i).Jz(j) correlations as in the demo script but the resulting datasets only have 2 components : the energy and the off-diagonal correlations (that I also want). Why is it so ?
Thanks,
Jean-David
On 09/01/2010 03:35 PM, Matthias Troyer wrote:
On 1 Sep 2010, at 11:14, Jean-David Picon wrote:
Dear all,
I diagonalized a 2x2 spin 1/2 system with fulldiag for different magnetic fields and I got only 14 energies in my datasets. I would have expected 16. What is wrong ?
Many thanks,
Jean-David
Dear Jean-David,
can you please post the input files?
Matthias
<S_ed_Tommaso2.py>