Re: [ALPS-users] Sx in 1D Hubbard Model

Dear Matthias, On 03/16/2011 09:46 AM, Matthias Troyer wrote:

You will need to define SPlus and Sminus for the Hubbard model. Dod you do that?

I thought they were already defined in the "fermion" basis, but I suppose those are particle operators and I'm trying to measure a site property... If I define <SITEOPERATOR name="Splus" site="x"> cdag_up(x)*c_down(x) </SITEOPERATOR> <SITEOPERATOR name="Sminus" site="x"> cdag_down(x)*c_up(x) </SITEOPERATOR> before <SITEOPERATOR name="Sx" site="x"> 1/2*(Splus(x)+Sminus(x)) </SITEOPERATOR> I get the expected result. Is this what you meant? Cheers, Miguel