Speaker
Description
The frustrated nearest-neighbour antiferromagnetic Ising model on the kagome lattice exhibits a macroscopic ground state degeneracy. We implement an MCMC algorithm to study the degeneracy lifting leading to the ground state of the dipolar model, focusing on models with up to fourth neighbour interactions.
The ground state of the J1-J2-J3 model exhibits five different phases as a function of the ratio J3/J2, four of which still have a non-zero residual entropy. We investigate how tensor networks can help to better understand these phases.
Surprisingly, in the model with dipolar couplings truncated at fourth neighbours, we find states lower in energy than the ground states of the dipolar J1-J2-J3 model and the full dipolar model: further neighbours must play a role.
