Quantum Surface Criticality Beyond Classical-Quantum Mapping

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Abstract
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Topological excitations in quantum systems render the d- to (d+1)-dimensional quantum–classical mapping not strictly valid, leading to non‑classical surface critical behaviors in two‑dimensional quantum systems. In this talk, I will present our quantum Monte Carlo simulation studies on these quantum surface critical behaviors. Employing designer models, we explore different mechanisms that induce non‑classical surface critical behaviors, in particular, edge engineering and boundary properties of symmetry‑protected topological states. Furthermore, we demonstrate that the dimer phase of the two‑dimensional dimerized Heisenberg model is topologically nontrivial，as evidenced by the non-classical surface critical behaviors.

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About the Speaker
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Wenan Guo obtained his Ph.D. from Beijing Normal University in 1996. He was a postdoctoral researcher at Delft University of Technology in the Netherlands, and has been a professor at Beijing Normal University since 2004. His research focuses on phase transitions and critical phenomena. In recent years, his research interests have included quantum magnetism in low dimensions, novel quantum states, and associated quantum phase transitions.