[ALPS-users] diagonal correlations

[Robertson Esperanza]

Hello,

I only started studying many-body physics, so there might be gaps in my
knowledge. When using the MEASURE_CORRELATION, why does the measurement
goes for only site i<j, is it because there will be "blowing up"?

Alternatively, to measure for i=j, i think I could use MEASURE_AVERAGE, of
let's say (n_i)^2 where n - n_up + n_down. How could I define such
measurement, where you use an operator successively? Thank you for replying

Robertson Esperanza
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