First-order phase transitions in spinor Bose gases and frustrated magnets

Abstract

We show that phase transitions in spin-one Bose gases and stacked triangular Heisenberg antiferromagnets -- an example of frustrated magnets with competing interactions -- are described by the same Landau-Ginzburg-Wilson Hamiltonian with O(3)$\times$O(2) symmetry. In agreement with previous nonperturbative-renormalization-group studies of the three-dimensional O(3)$\times$O(2) model, we find that the transition from the normal phase to the superfluid ferromagnetic phase in a spin-one Bose gas is weakly first order and shows pseudoscaling behavior. The (nonuniversal) pseudoscaling exponent $\nu$ is fully determined by the scattering lengths $a_0$ and $a_2$. We provide estimates of $\nu$ in ${}^{87}$Rb, ${}^{41}$K and ${}^7$Li atom gases which can be tested experimentally. We argue that pseudoscaling comes from either a crossover phenomena due to proximity of the O(6) Wilson-Fisher fixed point (${}^{87}$Rb and ${}^{41}$K) or the existence of two unphysical fixed points (with complex coordinates) which slow down the RG flow (${}^7$Li). These unphysical fixed points are a remnant of the chiral and antichiral fixed points that exist in the O($N$)$\times$O(2) model when $N$ is larger than $N_c\simeq 5.3$ (the transition being then second order and controlled by the chiral fixed point). Finally, we discuss a O(2)$\times$O(2) lattice model and show that our results, even though we find the transition to be first order, are compatible with Monte Carlo simulations yielding an apparent second-order transition.

arXiv commentv1) 16 pages, 15 figures, v2) revised version, 15 pages, 13 figures, v3) revised version, 15 pages, 13 figures

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