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Ssqr

The S2 operator is defined as S2x+S2y+S2z or: S2=τ,σ34aτ,σaτ,σ+τ1,τ2σ1,σ2σ1σ2aτ1σ1aτ2σ2aτ1σ1aτ2σ2aτ1aτ2aτ1aτ2, with σ the spin index which either can be 1/2 for spin up () or 1/2 for spin down (). The equivalent operator in Quanty is created by:

Example.Quanty
OppSsqr = NewOperator("Ssqr", NF, IndexUp, IndexDn)

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