paper

Universal finite-size scaling in the extraordinary-log boundary phase of three-dimensional model

arXiv:2411.05089 · doi:10.1103/PhysRevResearch.7.023052

Abstract

Recent advances in boundary critical phenomena have led to the discovery of a new surface universality class in the three-dimensional model. The newly found ``extraordinary-log" phase can be realized on a two-dimensional surface for , with , and on a plane defect embedded into a three-dimensional system, for any . One of the key features of the extraordinary-log phase is the presence of logarithmic violations of standard finite-size scaling. In this work we study finite-size scaling in the extraordinary-log universality class by means of Monte Carlo simulations of an improved lattice model. We simulate the model with open boundary conditions, realizing the extraordinary-log phase on the surface for , as well as with fully periodic boundary conditions and in the presence of a plane defect for . In line with theory predictions, renormalization-group invariant observables studied here exhibit a logarithmic dependence on the size of the system. We numerically access not only the leading term in the -function governing these logarithmic violations, but also the subleading term, which controls the evolution of the boundary phase diagram as a function of .

18 pages, 11 figures; v2: 21 pages, 11 figures, expanded sec. III.D, results unchanged

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