| Time：1121116 (Thur.) 12:00~14:00 Speaker：張博堯(Po-Yao Chang) Associate Professor, Department of physics, National Tsing Hua University Title：Entanglement diagnosis of many-body systems: applications to non-unitary conformal field theory and topological quantum field theories Abstract：Entanglement measures provide powerful tools for diagnosing quantum many-body phases of matter. In particular, in (1+1)-dimensional systems with conformal symmetry, entanglement entropy exhibits logarithmic scaling, where the coefficient determines the central charge of the underlying conformal field theory (CFT). However, in the absence of the unitary condition, the central charge can be negative, leading to negative entanglement entropy. To address this issue, we propose the generalized entanglement entropy to extract the negative central charges in several examples. In addition, in (2+1)-dimensional systems described by topological quantum field theories (TQFT), the sub-leading term of the entanglement entropy is referred to as the topological entanglement entropy (TEE), which contains information about the topological data of the quasiparticles. In this talk, I would like to discuss the TEE for different bipartitions. Place：F101, Gongguan Campus, NTNU |
