周正 学术报告

Title: Solving 3D CFTs with the Fuzzy Sphere: Chern-Simons-Matter Theories and Fermionic CFTs

Speaker: Zheng Zhou（周正）

Affiliation: Perimeter Institute, Canada（加拿大圆周理论物理研究所）

Time: 9:30-10:30am, Friday, 21st November, 2025 (UTC+8, Beijing Time)

Venue: Zoom Meeting (ID: 385 442 0225; Passcode: yauc)

Inviter: Yunfeng Jiang (江云峰)

Abstract

Conformal field theories in 3D are central to condensed-matter and high-energy physics. Among them, critical gauge theories, especially Chern-Simons-matter theories, stand out: They describe transitions where one or both phases are topologically ordered; they host conjectured dualities, and are proposed realisable experimentally in Moiré materials. To study them, the fuzzy sphere has shown exceptional efficiency and bridges CFTs with quantum Hall physics. As the first instance, I will present the confinement transition of the ν=1/2 bosonic Laughlin state, described by a scalar coupled to a U(1)_2 gauge field. I will show that this transition is continuous with emergent conformal symmetry, and discuss its critical properties. I will also report the first realisation of fermionic CFTs ― the free Majorana fermion — on the setup of a boson-fermion mixture, and conclude with a roadmap towards solving QED with Chern-Simons, interacting fermionic CFTs, and broader Lagrangian QFTs.

Speaker

Zhou Zheng is currently a Ph.D. student in physics at Perimeter Institute, Canada. His research is mainly focused on the theoretical and numerical study of exotic critical behavior in condensed matter systems, especially about conformal field theories, on the setup of fuzzy sphere, quantum Hall systems and lattice models, and with numerical tools like ED, DMRG and QMC.

The seminar will be broadcasted online by Zoom.

Interested people are free to join, without registration in advance.

The Zoom info is

URL: https://us02web.zoom.us/j/3854420225?pwd=SXY4eWJKOTBFZWJDaE16aXpTamY1QT09

Meeting ID: 385 442 0225

Passcode: yauc