Hello all, <div><br></div><div>I have been trying to compute the expectation value of </div><div>cdag(1) c(2) cdag(3) c(4) where two creation and two destruction operators are involved and 1, 2 ,3 and 4 label the sites in a spinless Hubbard model. Could anyone kindly tell me how I should define this in the parameter file or in the models.xml? </div>
<div>Thanks a lot!</div><div><br></div><div>Best, </div><div><br>
</div><div>Jun</div>