讲座主题：A lattice realization of general three-dimensional topological order

专家姓名：陈伟强

工作单位：南方科技大学

讲座时间：2023年9月16日 15:40-16:20

讲座地点：物电学院1511报告厅

主办单位：烟台大学物理与电子信息学院

内容摘要：

Topological orders are a class of phases of matter that beyond the Landau symmetry breaking paradigm. The two (spatial) dimensional (2d) topological orders have been thoroughly studied. It is known that they can be fully classified by a unitary modular tensor category (UMTC) and a chiral central charge c. And a class of 2d topological orders whose boundary are gappable can be systematically constructed by Levin-Wen model whose ground states are string-net condensed states. Previously, the three spatial dimensional topological orders have been classified based on their canonical boundary described by some special unitary fusion 2-category, $2\mathcal{V}ec_G^\omega$ or an EF 2-category. However, a lattice realization of a three spatial dimensional topological orders with both canonical boundary and arbitrary boundaries are still lacking. In this paper, we construct a 3d membrane-net model based on spherical fusion 2-category, which can be used to systematically study all general 3d topological order with gapped boundary. The partition function and lattice Hamiltonian of the membrane-net model is constructed based on state sum of spherical fusion 2-category. We also construct the 3d tube algebra of the membrane-net model to study excitations in the model. We conjecture all intrinsic excitations in membrane-net model have a one-to-one correspondence with the irreducible central idempotents (ICI) of the 3d tube algebra. We also provide a universal framework to study mutual statistics of all excitations in 3d topological order through 3d tube algebra.

主讲人介绍：

陈伟强2000年获得清华大学物理系学士学位。2006年获得清华大学物理系博士学位。2006年至2008年，香港大学物理系博士后。2008年至2011年，香港大学物理系研究助理教授。2011年至今，南方科技大学物理系副教授。研究领域主要为：拓扑物态，强关联系统，强关联数值模拟。