Posted by Steve Simon on May 3, 2014, 4:02 pm, in reply to "Revision question 6.13"
The point of the question is to realize that this is like an antiferromagnet -- every other site takes an opposite state in the ordered phase. So to solve this question, you need to think about sigma on sublattice A and seperately on sublattice B. So I think what the question should be asking is what is < sigma > only on an A site and what is
So I admit this question is badly posed. (It was an exam problem of course!)
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