Strong interlayer coupling and stable topological flat bands in twisted bilayer photonic Moiré superlattices

Chang-Hwan Yi; Hee Chul Park; Moon Jip Park

doi:10.1038/s41377-022-00977-4

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Strong interlayer coupling and stable topological flat bands in twisted bilayer photonic Moiré superlattices

Original Articles

- Strong interlayer coupling and stable topological flat bands in twisted bilayer photonic Moiré superlattices
- Light: Science & Applications Vol. 11, Issue 10, Pages: 2523-2529(2022)
- Affiliations：
  
  Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon 34126, Republic of Korea
- Author bio：
  
  Chang-Hwan Yi (yichanghwan@hanmail.net)
  Hee Chul Park (hcpark@ibs.re.kr)
  Moon Jip Park (moonjippark@ibs.re.kr)
- Funds：
- DOI：10.1038/s41377-022-00977-4
  CLC：
- Published：31 October 2022，
  
  Published Online：06 October 2022，
  
  Received：17 February 2022，
  
  Revised：14 August 2022，
  
  Accepted：31 August 2022
- Accepted：
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Yi, C. H., Park, H. C. & Park, M. J. Strong interlayer coupling and stable topological flat bands in twisted bilayer photonic Moiré superlattices. Light: Science & Applications, 11, 2523-2529 (2022).
DOI：

Yi, C. H., Park, H. C. & Park, M. J. Strong interlayer coupling and stable topological flat bands in twisted bilayer photonic Moiré superlattices. Light: Science & Applications, 11, 2523-2529 (2022). DOI： 10.1038/s41377-022-00977-4.

摘要

Abstract

The moiré 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 moiré 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 moiré 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 moiré 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 moiré 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 moiré superlattices beyond the weakly coupled regime.

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references

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