[ALPS-users] correlation functions using bond operators

[Robertson Esperanza]

Another question:

what does it mean  when x = source and y =  target? For example you have:
op1 = c_dagup(y)* c_up(x)
op2 = c_dagdown(y)*c_down(x)
and I can also do MEASURE_HALF_CORRELATIONS['op_corr'] = op1:op2. THis will
return a measurement
x = [i, i+1, j, j+1], y = some value. Does the source x from op1 still
corresponds to i and target y from op1 corresponds to i+1 (and the source x
from op2 still corresponds to j and target y from op2 corresponds to j+1)?

Regards,
Robertson Esperanza


On Tue, May 9, 2017 at 8:31 PM, Robertson Esperanza <
robbie.esperanza at gmail.com> wrote:

> Hello,
>
> Thanks for all the previous help. What I've done so far is measuring
> correlation functions using site opertors, now I'm dealing with bond
> operators. For mps_optim,  it seems that i can only measure correlations
> between single-term bond operators. For example:
> op1 = c_dagup(x)* c_up(y)
> op2 = c_dagdown(x)*c_down(y)
> and I can do MEASURE_HALF_CORRELATIONS['op_corr'] = op1:op2. From the
> results, it seems that it returns
> x = [i, i+1, j, j+1], y = some value
>
> I am dealing with a 10 site chain, but i only got results (for i=0) j=
> 2,...,8. How can i calculate the same correlation functions for j = 0, 1,
> and 9?
>
> Regards,
> Robbie
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.phys.ethz.ch/pipermail/comp-phys-alps-users/attachments/20170523/9b3c231f/attachment.html>