Dear ITensor team,

Thanks for the reply. Recently, I want to calculate string operator in Haldane phase., e.g. <s^{z}*{I}exp(I\pi\sum*{k}*{i=<k<j}s^{z}*{k})s^{z}_{j}>, but in ITensor doc, I just find time evolution exponential operation (for t must be small) but not find exponential the ordinary autoMPO. So I want to ask how do we calculate the string operator in the simple way ? Many thanks !

Best regards,

sugar