Dear All,

I am struggling to define the Sy operator in my Hamiltonian. For the
'Spin' hamiltonian the Sx operator is defined as

<SITEOPERATOR name="Sx" site="x">
   1/2*(Splus(x)+Sminus(x))
</SITEOPERATOR>

however when i attempted defining Sy in a similar manner:

<SITEOPERATOR name="Sy" site="x">
   1j/2*(Splus(x)-Sminus(x))
</SITEOPERATOR>

the simulations halt without producing any output. Could you point me
how to implement the Sy operator properly and where am i making a
mistake?

In the long run I am attempting to apply two different fields in the XY
plane, GammaX along x and GammaY along y

Kind regards,
Stan


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