Hello professor Troyer,
I am trying to use ALPS to study a
magnetic heisenberg ladder with anti-fm interactions in the rail direction
and ferromagnetic interactions in the rung direction. I believed it would be
easy to simulate if I set J_rung= 1 and J_rail= -1 but I get the same MvT
results whether I do it this way or make it a uniform ladder. Is changing
the sign the correct way to simulate ferromagnetic interactions?
thanks for your help, Brian