Strong interlayer coupling and stable topological flat bands in twisted bilayer photonic Moire superlatticesopen access
- Authors
- Yi, Chang-Hwan; Park, Hee Chul; Park, Moon Jip
- Issue Date
- Oct-2022
- Publisher
- SPRINGERNATURE
- Keywords
- BOUNDARY-ELEMENT METHOD; MAGIC-ANGLE; STATES
- Citation
- LIGHT-SCIENCE & APPLICATIONS, v.11, no.1, pp.1 - 7
- Indexed
- SCIE
SCOPUS
- Journal Title
- LIGHT-SCIENCE & APPLICATIONS
- Volume
- 11
- Number
- 1
- Start Page
- 1
- End Page
- 7
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189111
- DOI
- 10.1038/s41377-022-00977-4
- ISSN
- 2095-5545
- Abstract
- The moire superlattice of misaligned atomic bilayers paves the way for designing a new class of materials with wide tunability. In this work, we propose a photonic analog of the moire superlattice based on dielectric resonator quasi-atoms. In sharp contrast to van der Waals materials with weak interlayer coupling, we realize the strong coupling regime in a moire superlattice, characterized by cascades of robust flat bands at large twist-angles. Surprisingly, we find that these flat bands are characterized by a non-trivial band topology, the origin of which is the moire pattern of the resonator arrangement. The physical manifestation of the flat band topology is a robust one-dimensional conducting channel on edge, protected by the reflection symmetry of the moire superlattice. By explicitly breaking the underlying reflection symmetry on the boundary terminations, we show that the first-order topological edge modes naturally deform into higher-order topological corner modes. Our work pioneers the physics of topological phases in the designable platform of photonic moire superlattices beyond the weakly coupled regime.
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