题 目：Landau-Ginzburg paradigm of topological phases of matter
报告人：万义顿 教授 复旦大学
时 间：2025年11月4号（星期二）上午10:00
地 点：LE201
邀请人：胡自翔
报告摘要：Topologically ordered phases of matter have long been regarded as lying beyond the Landau–Ginzburg paradigm of symmetry breaking. Our recent studies of anyon condensation, however, suggest that such phases may, in fact, be brought back within the Landau–Ginzburg framework. In this talk, I will present a framework that brings topological phases back into the Landau–Ginzburg picture by reformulating the string-net model to be a genuine lattice gauge theory coupled to anyonic matter fields. Within this modified model, topological phase transitions induced by anyon condensation and their consequent phenomena, such as order parameter fields, coherent states, Goldstone modes, and gapping gauge degrees of freedom, can be formulated as Landau's effective theory of the Higgs mechanism.
万义顿，复旦大学物理系长聘教授。华南理工大学计算机与经济学双学士(1998)、美国宾夕法尼亚大学计算机硕士(2002)、加拿大渥太华大学物理硕士(2004)、加拿大滑铁卢大学暨圆周理论物理研究所理论物理博士(2009)，于日本近畿大学、东京大学、加拿大圆周理论物理研究所做博士后，2016年加入复旦物理系，从事拓扑物态、量子信息与计算、宇宙学等领域的研究。