Dear Colleagues,
  I want to investigate the dephasing effect in the coherent junction, so I want to couple a phenomenological term $i\frac{\Gamma}{2}$ to the Hamiltonian $H(\phi)$. I want plot the figure that describe the conductance via the phase $\phi$ at different dephasing strength $\Gamma$. 
  I try it, but the total Hamiltonian becomes non-hermitian. The program got broken.

  How to realize this by Kwant?  Can you give more ways or some examples.

Jinlong Zhang