Dear all,
Taking the Kondo lattice model as an example which is included in the models.xml file, I was wondering how the distinction between the onsite exchange and the hopping is made. In terms of the Hamiltonian, there are sites with type 1 (itinerant fermions) and type 2 (local spins). However, both the hopping and the exchange are implemented in terms of bond operators acting between sites i and j, with the type of site not specified. Is that sufficient to ensure that the exchange acts within the two-site unit cell, i.e, between the local spin and an itinerant spin at the same lattice site?
Thanks,
Martin