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Heisenberg hamiltonian

by LagrangeEuler
Tags: hamiltonian, heisenberg
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LagrangeEuler
#1
Feb5-14, 04:53 AM
P: 316
For two electron system ##\vec{S}_1##, ##\vec{S}_2##
[tex]\mathcal{H}=J\vec{S}_1\cdot \vec{S}_2=J(\frac{1}{2}(S_{tot})^2-\frac{3}{4}) (1)[/tex]
How you get relation (1)?
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M Quack
#2
Feb5-14, 05:41 AM
P: 669
hint: [itex](\vec{S}_1+\vec{S}_2)^2[/itex]


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