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Enforced symmetry breaking in 3D topological order: time reversal incompatibility and a possible road to parity violation

组织者

白岸斯 , 陈群皓 , 孔良 , 王亦龙 , 张智浩 , 郑浩

演讲者

Shang-Qiang Ning

时间

2025年05月27日 09:45 至 11:30

地点

A3-2-301

线上

Zoom 468 248 1222 (BIMSA)

摘要

Symmetry can be intrinsically broken in topological phases due to inherent incompatibilities with their underlying topological structure—a phenomenon known as enforced symmetry breaking (ESB). In this talk, I first review the concept of ESB in two-dimensional invertible topological order and then extend the discussion to three-dimensional fermionic topological order. In particular, I discuss an example of three-dimensional fermionic topological order that exhibits ESB of time-reversal symmetry (with $T^2 = 1$). I also examine how the ESB of time-reversal symmetry is related to that of parity symmetry, shedding light on a potential new route toward parity violation.