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Answer by Adam for Wick's theorem and transverse field Ising model
Eq. 2.A.30 is a somewhat non-trivial identity for the ground-state $|\psi_0\rangle$ which only uses the ground-state property that $\eta_q|\psi_0\rangle =0$. (Of course, as the OP has noted,...
View ArticleWick's theorem and transverse field Ising model
I am trying to understand calculation of correlation function in the ground state of the Transverse Field Ising model, from the following book, which is freely available:...
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