Dear all,
I am trying to add the spin-orbit coupling term to the 1D Hubbard model. I use the standard files for 1D Hubbard model in the library and add those codes: ----------------------------------------------------------------------------------- <BONDOPERATOR name="SOC" source="x" target="y">
cdag_up(y)*c_down(x)-cdag_down(y)*c_up(x)+cdag_down(y)*c_up(x)-cdag_up(y)*c_down(x) </BONDOPERATOR> ----------------------------------------------------------------------------------- and ----------------------------------------------------------------------------------- <BONDTERM source="i" target="j"> <PARAMETER name="t#" default="0"/> <PARAMETER name="alpha" default="0"/> -t*fermion_hop(i,j)-*alpha**SOC(i,j) </BONDTERM> ----------------------------------------------------------------------------------- to the model XML file just like before. But it seems it does not work. The results keep the same when I change the parameter 'alpha' .
Can you give me some advices ? Thank you very much in advance.
With best wishes, Ahai Chen -------------------------------------------------------------------------- Ahai Chen Department of Physics, Zhejiang Normal University Jinhua, Zhejiang Province, 321004, China e-mail: chenahaiphysics@gmail.com; chenahai@yahoo.cn --------------------------------------------------------------------------