Hi all,
I'm trying to calculate the Neel temperature in an Heisenberg antiferromagnet and wonder how the symmetry breaking is considered in dirloop_sse: Do I have to define the direction of symmetry breaking by including a small (small enough to not affect the results) magnetic field? If so, is there a way to do simulations with transverse staggered magnetic fields in ALPS/diroop_sse? (the <HAMILTONIAN name="spin"> node in models.xml looks like it only allows for a uniform transverse field Gamma) How would one specify this field in case that the unit cell is not primitive? What does dirloop_sse calculate below the Neel temperature in case no direction of symmetry breaking is specified (do one get an average over many different directions?) ?
I'd be glad about any advice,
Beni Thielemann