# Heisenberg hamiltonian

by LagrangeEuler
Tags: hamiltonian, heisenberg
 P: 276 For two electron system ##\vec{S}_1##, ##\vec{S}_2## $$\mathcal{H}=J\vec{S}_1\cdot \vec{S}_2=J(\frac{1}{2}(S_{tot})^2-\frac{3}{4}) (1)$$ How you get relation (1)?
 P: 640 hint: $(\vec{S}_1+\vec{S}_2)^2$

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