Speaker: 杨波 (Nanyang Technological University)

Time: August 30, 2024 15:00

Place: 理科楼C302

报告摘要：The fractional quantum Hall (FQH) effect realized in Landau levels is a family of strongly correlated topological quantum fluids in two-dimension, with exotic low lying charge excitations that are anyonic and even non-Abelian. Here we propose a unified framework in understanding the integer and fractional quantum Hall systems via Hilbert space truncation, so that these quantum fluids consist of “elementary particles” emerging from special "2D universes" with conformal symmetry. Interestingly, the hierarchical structure of these 2D conformal universes (or conformal Hilbert spaces) allows us to reveal internal structures of anyons of the FQH phases (e.g. the Laughlin and Moore-Read phases), and to derive experimentally relevant conditions for such anyons or quasiholes to undergo fractionalisation within the same topological phase. We will also discuss about the long wavelength neutral excitations analogous to the spin-2 graviton and higher-spin-mode in these topological quantum fluids. The former has been recently measured with Raman scattering, and we propose possible ways of detecting higher spin modes with multi-photon processes or Laguerre-Gaussian beam in experiments.

[1] Bo Yang, Phys. Rev. Lett. 127, 126406 (2021).

[2] Yuzhu Wang and Bo Yang, Nat. Commun. 14, 2317 (2023)

[3] Ha Quang Trung and Bo Yang, Phys. Rev. Lett. 127, 046402 (2021).

报告人简介：Assistant Professor Yang Bo obtained his Bachelor’s degree in Science from Stanford University, and PhD from Princeton University. He is the research scientist from 2014 to 2018 at the Institute of High Performance Computing under A*STAR, focusing on non-linear dynamics, complex systems and traffic flow modelling/simulation. He joined the Nanyang Technological University as an assistant professor with the National Research Foundation Fellowship in 2020. Dr. Yang Bo is interested in emergent behaviours from both classical and quantum many body systems, with a particular focus on fractional quantum Hall and anomalous quantum Hall effect and topological materials.