====== Sx ======

###
The $S_x$ operator is defined as:
\begin{equation}
S_x = \sum_{\tau} \frac{1}{2}\left(a^{\dagger}_{\tau\uparrow}a^{\phantom{\dagger}}_{\tau\downarrow} + a^{\dagger}_{\tau\downarrow}a^{\phantom{\dagger}}_{\tau\uparrow}\right).
\end{equation}
The equivalent operator in Quanty is created by:
<code Quanty Example.Quanty>
OppSx = NewOperator("Sx", NF, IndexUp, IndexDn)
</code>
###


===== Table of contents =====
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