Title: Lattice Study of Critical and Symmetry BreakingPhases with Categorical Symmetry

Speaker:   Prof. Wang, Chenjie (王晨杰), University of Hong Kong

Time: 10:00 am, December 26 (Friday),2025

Place: Room M830,IOP-CAS(中国科学院物理研究所M830)

Abstract
In this talk, I will present a construction of a family of 1D quantum latticemodels that respect unitary fusion category symmetry. This familygeneralizes the well-known anyon chains and can be viewed as edgemodels of2D symmetry-enriched topological states. These models exhibia variety of interesting phases, including a gapless critical phase arisingfrom the absence of relevant symmetric operators permitted by the fusioncategory symmetry, Ferromagnetic and antiferromagnetic phases withbroken categorical symmetries will also be discussed. I will show that theantiferromagnetic phase differs fundamentally from conventionalantiferromagnets due to the non-invertibility of magnetic domain wallsFinally, phase transitions between these phases, being either gapped-to.gapless or gapless-to-gapless transitions, will also be briefly discussed

About the speaker
Dr. Chenjie Wang, currently Associate Professor at University of HongKong, graduated from University of Science and Technology of China in2007 and obtained his PhD from Brown University in 2012. He joinedHKU in 2019. He has been working on transport in quantum Hall effectsand theory of strongly correlated topological phases. His recent researchinterests include generalized symmetries in topological and critical statesofmatter and localization physics