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documentation:standard_operators:spin:ssqr [2016/10/05 23:54] – created Maurits W. Haverkort | documentation:standard_operators:spin:ssqr [2016/10/10 09:41] (current) – external edit 127.0.0.1 | ||
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+ | ====== Ssqr ====== | ||
+ | ### | ||
+ | The S2 operator is defined as S2x+S2y+S2z or: | ||
+ | \begin{eqnarray} | ||
+ | S^2 &=& \sum_{\tau, | ||
+ | \nonumber &+& \sum_{\tau_1, | ||
+ | \nonumber && | ||
+ | \end{eqnarray} | ||
+ | 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: | ||
+ | <code Quanty Example.Quanty> | ||
+ | OppSsqr = NewOperator(" | ||
+ | </ | ||
+ | ### | ||
+ | |||
+ | ===== Table of contents ===== | ||
+ | {{indexmenu> |