Heisenberg hamiltonian

  1. 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)?
     
  2. jcsd
  3. hint: [itex](\vec{S}_1+\vec{S}_2)^2[/itex]
     
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