Special Transition and Extraordinary Phase on the Surface of a Two-Dimensional Quantum Heisenberg Antiferromagnet

Abstract

Continuous phase transitions exhibit richer critical phenomena on the surface than in the bulk, because distinct surface universality classes can be realized at the same bulk critical point by tuning the surface interactions. The exploration of surface critical behavior provides a window looking into higher-dimensional boundary conformal field theories. In this work, we study the surface critical behavior of a two-dimensional (2D) quantum critical Heisenberg model by tuning the surface coupling strength, and discover a direct special transition on the surface from the ordinary phase into an extraordinary phase. The extraordinary phase has a long-range antiferromagnetic order on the surface, in sharp contrast to the logarithmic decaying spin correlations in the 3D classical O(3) model. The special transition point has a new set of critical exponents, $y_s=0.86(4)$ and ${\eta }_{\parallel }=-0.33(1)$, which are distinct from the special transition of the classical O(3) model and indicate a new surface universality class of the 3D O(3) Wilson-Fisher theory.

arXiv comment16 pages, 10 figures

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Cited by in corpus (7)

• Symmetry protected topological phases under decoherence
• A plane defect in the 3d O$(N)$ model
• The ordinary surface universality class of the three-dimensional O($N$) model
• Measuring the Boundary Gapless State and Criticality via Disorder Operator
• Topological physics in quantum critical systems
• Boundary phase transitions of two-dimensional quantum critical XXZ model
• Boundary operator product expansion coefficients of the three-dimensional Ising universality class