Precise many-body simulations of antiferromagnetic phases using broken-symmetry perturbative expansions
Precise many-body simulations of antiferromagnetic phases using broken-symmetry perturbative expansions
We introduce a spin-symmetry-broken extension of the connected determinant algorithm [Phys.Rev. Lett. 119, 045701 (2017)]. The resulting systematic perturbative expansions around an antiferromagnetic state allow for numerically exact calculations directly inside a magnetically ordered phase. We show new precise results for the magnetic phase diagram and thermodynamics of the three-dimensional …