
<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>Hello,</div><div><br></div><div>The measurements you are asking for are usually four body operators.</div><div>I don't think the base ALPS model library implements them.</div><div><br></div><div>For the MPS applications we support more generic measurements, like n-body correlation functions.</div><div><br></div><div>Specifically for the pair correlation we have a paper measuring them for some Hubbard ladders.</div><div><p style="box-sizing: border-box; margin: 0px 0px 1.42857rem; padding: 0px; line-height: 1.6; text-rendering: optimizeLegibility;"><span style="background-color: rgba(255, 255, 255, 0);"><span class="doi" style="box-sizing: border-box;">DOI:</span><span class="doi-field" style="box-sizing: border-box; margin-left: 1rem;"><a href="https://doi.org/10.1103/PhysRevB.92.195139">https://doi.org/10.1103/PhysRevB.92.195139</a></span></span></p><section id="rights" style="box-sizing: border-box; position: relative;"></section></div><div><br></div><div>Best,</div><div>Michele</div><div><br>On 15 Sep 2017, at 08:59, Chia-Chen Chang <<a href="mailto:cxc639@gmail.com">cxc639@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><span>Greetings ALPS users. </span><br><span></span><br><span>For benchmark purposes, I'm interested in getting superconducting</span><br><span>pair correlation functions on small clusters using ALPS' exact </span><br><span>diagonalization library. If this is doable, I am wondering if there </span><br><span>is a way to define extended operators such as d-wave or p-wave pair </span><br><span>field operators? Thanks for your help!</span><br><span></span><br><span>Chiachen Chang</span><br><span></span><br><span></span><br><span></span><br><span></span><br><span></span><br><span></span><br><span></span><br><span></span><br><span></span><br><span>----</span><br><span>Comp-phys-alps-users Mailing List for the ALPS Project</span><br><span><a href="http://alps.comp-phys.org/">http://alps.comp-phys.org/</a></span><br><span></span><br><span>List info: <a href="https://lists.phys.ethz.ch//listinfo/comp-phys-alps-users">https://lists.phys.ethz.ch//listinfo/comp-phys-alps-users</a></span><br><span>Archive: <a href="https://lists.phys.ethz.ch//pipermail/comp-phys-alps-users">https://lists.phys.ethz.ch//pipermail/comp-phys-alps-users</a></span><br><span></span><br><span>Unsubscribe by writing a mail to <a href="mailto:comp-phys-alps-users-leave@lists.phys.ethz.ch">comp-phys-alps-users-leave@lists.phys.ethz.ch</a>.</span><br></div></blockquote></body></html>