The Wilson-Fisher criticality provides a paradigm for a large class of phase transitions in nature (e.g., helium, ferromagnets). In the three dimension, Wilson-Fisher critical points are not exactly solvable due to the strongly-correlated feature, so one has to resort to non-perturbative tools such as numerical simulations. Here, we design a microscopic model of Heisenberg magnet bilayer and study the underlying Wilson-Fisher $\mathrm{O}(3)$ transition through the lens of fuzzy sphere regularization. We uncover a wealth of crucial information which directly reveals the emergent conformal symmetry regarding this fixed point. In specific, we accurately calculate and analyze the energy spectra at the transition, and explicitly identify the existence of a conserved Noether current, a stress tensor and relevant primary fields. Most importantly, the primaries and their descendants form a fingerprint conformal tower structure, pointing to an almost perfect state-operator correspondence. Furthermore, by examining the leading rank-4 symmetric tensor operator, we demonstrate the cubic perturbation is relevant, implying the critical $\mathrm{O}(3)$ model is unstable to cubic anisotropy, in agreement with the renormalization group and bootstrap calculations. The successful dissection of conformal content of the Wilson-Fisher universality class extends the horizon of the fuzzy sphere method and paves the way for exploring higher dimensional conformal field theories.
The $O(N)$ Free-Scalar and Wilson-Fisher Conformal Field Theories on the Fuzzy Sphere
C. N. Yang Institute for Theoretical Physics, Stony Brook University（石溪大学杨振宁理论物理研究所）；Perimeter Institute for Theoretical Physics（_perimeter理论物理研究所）；Department of Physics and Astronomy, University of Waterloo（滑铁卢大学物理与天文学系）
Conformal Data for the O(3) Wilson-Fisher Conformal Field Theory from Fuzzy Sphere Realization of the Quantum Rotor Model
Laboratory for Theoretical and Computational Physics, PSI Center for Scientific Computing, Theory and Data（理论计算物理实验室）；Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL)（洛桑联邦理工学院物理研究所）；Univ. Grenoble Alpes, CNRS, LPMMC（格勒诺布尔阿尔卑斯大学）
Conformal Data for the $O(2)$ Wilson-Fisher CFT in $(2+1)$-Dimensional Spacetime from Exact Diagonalization and Matrix Product States on the Fuzzy Sphere
Laboratory for Theoretical and Computational Physics, PSI Center for Scientific Computing, Theory and Data（理论计算物理实验室）；Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL)（洛桑联邦理工学院物理研究所）；Univ. Grenoble Alpes, CNRS, LPMMC（格勒诺布尔阿尔卑斯大学）；Institut des Hautes Études Scientifiques（高等科学研究所）
Graduate Group in Applied Science & Technology, University of California, Berkeley（加州大学伯克利分校应用科学与技术研究生组）；Department of Physics, Harvard University（哈佛大学物理系）；Materials Research Laboratory, Massachusetts Institute of Technology（麻省理工学院材料研究实验室）
Symmetry-breaking line defects embedded to a 3D $O(N)$ critical bulk
Fudan University（复旦大学）；Hong Kong University of Science and Technology（香港科技大学）；Hunan University（湖南大学）；Hefei National Laboratory（合肥国家实验室）；Westlake Institute for Advanced Study（西湖高等研究院）；Westlake University（西湖大学）
