File talk:Valence bond solid.png

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There is a technical error in this figure of RVB state. At the bottom of the image where a valence bond (or equivalently a Cooper pair) is enlarged, the 'plus' sign between two antiferromagnetic state should be a 'minus' sign. Because for RVB the electrons (spins) in a valence bond are in a singlet state and NOT a triplet.

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