Yunqin Zheng: Non-invertible Duality Defects: Lattice, Field Theory and Symmetry

Recent years have witnessed an explosion of studies of the non-invertible symmetries in various dimensions. In this talk, I will revisit the most vanilla type of non-invertible symmetry — Kramers-Wannier duality symmetry in (1+1)d, from three different perspectives: 1. lattice; 2. field theory; 3. Symmetry TFT. 
This talk is based on a work in collaboration with Justin Kaidi and Kantaro Ohmori [2209.11062], and an upcoming work with Linhao Li and Masaki Oshikawa.