Composite operators for BCS Superconductor
J. Bonca, A. V. Balatsky
Abstract
The new form of the composite operator generalizing the Cooper pairs for a BCS superconductor is introduced. The approach is similar to the derivation of the composite operator of the odd - frequency superconductors. The examples of the dx2-y2-,~dxy- and p- wave composite operators for a 2D t-J model are given.
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