Hello,<br><br>I would like to know if the parameter RESTRICT_MEASUREMENTS[Sz] works for dirloop_sse as indicated at <a href="http://alps.comp-phys.org/mediawiki/index.php/Documentation:dirloop_sse" target="_blank">http://alps.comp-phys.org/mediawiki/index.php/Documentation:dirloop_sse</a>.<br>

<br><br>I&#39;m trying to obtain the gap for (3d), H=J( S+(i)S(i+1)- + S-(i)S+(i+1) ) +D(Sz)^2 at D &gt; Dc by calculating energy difference from E(Mz=1) , E(Mz=0) at low temperature.<br><br>Since &lt;Sz(i)Sz(i+1)&gt; ~ 0 , and dirloop does not measure off-diagonal correlations , I was wandering if I could use this procedure in dirloop to estimate the gap.<br>

<br><br>Thanks,<br><br>Marcelo Guimaraes.<br><br><br>