Dear Alps users, I want to make a spin_y operator in the spin basis. I know that spin x can be constructed in this way: <SITEOPERATOR name="Sx" site="x"> 1/2*(Splus(x)+Sminus(x)) </SITEOPERATOR> To get Sy i need to have complex i in the operator, but I am unsure of how to express it. Best regards, Simon Ydman