Programme

I.12 -- Invited, VCTP-46

Date: Wednesday, 6 October 2021

Time: 16:30 - 17:00

Magic configurations in moiré superlattice of bilayer photonic crystal

Hai-Chau Nguyen

University of Siegen

We investigate the physics of photonic band structures of the moiré patterns that emerged when overlapping two unidimensional (1D) photonic crystal slabs with mismatched periods. The band structure of our system is a result of the interplay between intralayer and interlayer coupling mechanisms, which can be fine-tuned via the distance separating the two layers. We derive an effective Hamiltonian that captures the essential physics of the system and reproduces all numerical simulations of electromagnetic solutions with high accuracy. Most interestingly, magic distances corresponding to the emergence of photonic flatbands within the whole Brillouin zone of the moiré superlattice are observed. We demonstrate that these flatband modes are tightly localized within a moiré period. Our results show that the band structure of bilayer photonic moiré can be engineered in the same fashion as the electronic/excitonic counter-parts. Our work therefore paves the way to the possibility of exploring the many-body physics with photonic moiré systems.

Presenter: Nguyen Hai Chau