1305.1198 (G. J. Conduit)

Quantum Monte Carlo study of the two-dimensional ferromagnet    [PDF]

G. J. Conduit

We present Quantum Monte Carlo calculations that probe the paramagnet-ferromagnet phase transition in a two-dimensional Stoner Hamiltonian. With a screened Coulomb interaction we observe a first order ferromagnetic transition for short screening lengths, and a second order transition with a longer screening length, accompanied by a rising critical interaction strength. Finally, we discuss the consequences of our results for an ultracold atomic gas with finite ranged interactions.

View original: http://arxiv.org/abs/1305.1198