講座主題：A lattice realization of general three-dimensional topological order
專家姓名：陳偉強(qiáng)
工作單位：南方科技大學(xué)
講座時(shí)間：2023年9月16日 15:40-16:20
講座地點(diǎn)：物電學(xué)院1511報(bào)告廳
主辦單位：煙臺大學(xué)物理與電子信息學(xué)院
內(nèi)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.
主講人介紹：
陳偉強(qiáng)2000年獲得清華大學(xué)物理系學(xué)士學(xué)位。2006年獲得清華大學(xué)物理系博士學(xué)位。2006年至2008年，香港大學(xué)物理系博士后。2008年至2011年，香港大學(xué)物理系研究助理教授。2011年至今，南方科技大學(xué)物理系副教授。研究領(lǐng)域主要為：拓?fù)湮飸B(tài)，強(qiáng)關(guān)聯(lián)系統(tǒng)，強(qiáng)關(guān)聯(lián)數(shù)值模擬。
