Speaker
Olivier Clement Romain Gauthe
(EPFL)
Description
We use finite-temperature tensor network algorithms to investigate the spin-1/2 J1−J2 Heisenberg model on the square lattice. We provide strong numerical evidence in favor of an Ising transition in the collinear phase of the model, confirming a 30 years old field theory prediction. In units of J2, the critical temperature reaches a maximal value of Tc/J2≃0.18 around J2/J1≃1.0. It is strongly suppressed upon approaching the zero-temperature boundary of the collinear phase J2/J1≃0.6, and it vanishes as 1/log(J2/J1) in the large J2/J1 limit. We stress the importance of symmetry implementation and discuss the new perspectives in the investigation of the thermal properties of quantum Heisenberg antiferromagnets.
Authors
Prof.
Frédéric Mila
(EPFL)
Olivier Clement Romain Gauthe
(EPFL)