paper

Boundary critical behavior of the three-dimensional Heisenberg universality class

arXiv:2012.00039 · doi:10.1103/PhysRevLett.126.135701

Abstract

We study the boundary critical behavior of the three-dimensional Heisenberg universality class, in the presence of a bidimensional surface. By means of high-precision Monte Carlo simulations of an improved lattice model, where leading bulk scaling corrections are suppressed, we prove the existence of a special phase transition, with unusual exponents, and of an extraordinary phase with logarithmically decaying correlations. These findings contrast with naïve arguments on the bulk-surface phase diagram, and allow us to explain some recent puzzling results on the boundary critical behavior of quantum spin models.

11 pages, 3 figures, including Supplemental Material; v2: expanded discussion and technical details, results unchanged, 12 pages, 3 figures including Supplemental Material; v3: incorporates erratum, correct fit of helicity modulus, other results unchanged, 12 pages, 3 figures

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