直播二维码
Exploring Chern-Simons Theories in Layered 3+1d Systems
报告人
Prof. Meng Cheng（Yale University）
时间
2021年10月21日 10:00
报告摘要
2+1d U(1) Chern-Simons (CS) gauge theories provide a simple and complete description of all 2+1d Abelian topological phases. In this talk, we discuss how the theoretical framework can be used to explore new possibilities in the world of 3+1d quantum phases of matter. The 3+1d generalization involves an infinite number of 2+1d U(1) gauge fields, which can be thought of as living in different layers, coupled through CS terms. When the theory is fully gapped, it describes a kind of fracton topological order, where all particles are restricted to move in planes. We will discuss how these new examples compare with existing constructions of fracton order. Perhaps even more interestingly, for certain couplings the theory can become gapless. We will discuss our current understanding of the nature of the gapless theories, with the help of a microscopic realization in terms of coupled wire constructions. We will argue that these models realize new types of compressible quantum liquids.
报告人介绍
图 | Meng Cheng
Prof. Meng Cheng is an Assistant Professor of Physics at Yale University. He received his undergraduate degree from Nanjing University. In 2013, he obtained his Ph.D. degree from the University of Maryland, College Park, where he studied topological superconductivity and its applications in quantum information processing. He then moved to a postdoctoral researcher position in Microsoft Research, Station Q in Santa Barbara, during which he investigated the interplay of global symmetry and topological quantum order. He joined the Department of Physics at Yale University in 2016.
自从20世纪80年代铜氧高温超导和分数量子霍尔效应发现以来，强关联电子体系已成为凝聚态物理中超越朗道范式、发现由相互作用导致的新奇物质态的重要的理论和实验研究平台。由于强相互作用（比如分数量子霍尔态里面电子之间的库伦相互作用能标远大于朗道能级的有效动能）的存在，电子体系的强关联拓扑物态完全无法用能带图像来解释。近年来，多体纠缠的引入，比如拓扑纠缠熵和局域幺正变换等概念，对强关联拓扑物态、或更加准确地讲，“强纠缠拓扑量子物态”的研究产生了深远的影响。研究强纠缠拓扑量子物态需要全新的物理理论、数学语言和数值计算方法，在国际上，该方面的研究已经引起了多学科的关注，比如凝聚态物理、量子信息、超冷原子物理、高能物理和数学物理。在这个背景下，本报告会由粤港澳大湾区的相关领域的科研工作者倡议创立，拟邀请国内外相关领域的物理学家、数学家作报告，以促进国内外学术交流和学术创新。
陈伟强（南方科技大学）
顾正澄（香港中文大学）
孔 良（南方科技大学）
兰 天（香港中文大学）
梅佳伟（南方科技大学）
王晨杰（香港大学）
叶 鹏（中山大学）
粤港澳大湾区“强纠缠拓扑量子物质态”报告会专题直播&回放链接：
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