Programme

I.7 -- Invited, VCTP-47

Date: Monday, 1 August 2022

Time: 17:00 - 17:30

Online presentation

Synthetic Weyl semimetal and quantum anomalous Hall state in a one-dimensional system of trilayer photonic grating

D.-H.-Minh Nguyen (1*), Xuan Dung Nguyen (2), Chiara Devescovi (1), Hai Son Nguyen (3,4), and Dario Bercioux (1,5)

(1) Donostia International Physics Center, 20018 Donostia-San Sebastian, Spain (2) Brown Theoretical Physics Center and Department of Physics, Brown University, 182 Hope Street, Providence, Rhode Island 02912, USA (3) Univ Lyon, ECL, INSA Lyon, CNRS, UCBL, CPE Lyon, INL, UMR5270, 69130 Ecully, France (4) Institut Universitaire de France (IUF) (5) IKERBASQUE, Basque Foundation for Science, Euskadi Plaza, 5, 48009 Bilbao, Spain

We study the spectral properties of a one-dimensional (1D) trilayer photonic grating in a 3D hybrid momentum space, where the interlayer shifts play the role of two synthetic momenta besides the conventional momentum of our 1D system. As the synthetic momenta are even under the time-reversal operation, this family of 1D lattice can host states that are realized in systems with broken time-reversal symmetry. We find that highly tunable Weyl semimetal, nodal line semimetal, and quantum anomalous Hall state can be realized in such a trilayer waveguide. The results show that multilayer photonic grating is not only a promising platform for studying higher-dimensional topological physics but also a simple one for observeing interface states between 3D systems, which is difficult in condensed matter physics.

Presenter: Nguyen Duy Hoang Minh