Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices

Omar Jamadi; Elena Rozas; Grazia Salerno; Marijana Milićević; Tomoki Ozawa; Isabelle Sagnes; Aristide Lemaître; Luc Le Gratiet; Abdelmounaim Harouri; Iacopo Carusotto; Jacqueline Bloch; Alberto Amo

doi:10.1038/s41377-020-00377-6

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Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices

Original Articles

- Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices
- Light: Science & Applications Vol. 9, Issue 5, Pages: 1427-1436(2020)
- Affiliations：
  
  1.Université de Lille, CNRS, UMR 8523—PhLAM—Physique des Lasers Atomes et Molécules, 59000 Lille, France
  2.Depto. de Física de Materiales e Instituto Nicolás Cabrera, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
  3.Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, CP 231, Campus Plaine, B-1050 Brussels, Belgium
  4.Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies, 91120 Palaiseau, France
  5.Interdisciplinary Theoretical and Mathematical Sciences Program (iTHEMS), RIKEN, Wako, Saitama 351-0198, Japan
  6.INO-CNR BEC Center and Dipartimento di Fisica, Universita di Trento, 38123 Povo, Italy
- Author bio：
  
  Omar Jamadi (omar.jamadi@univ-lille.fr)
- Funds：
- DOI：10.1038/s41377-020-00377-6
  CLC：
- Published：2020，
  
  Published Online：19 August 2020，
  
  Received：28 January 2020，
  
  Revised：18 July 2020，
  
  Accepted：23 July 2020
- Accepted：
Scan QR Code
Jamadi, O. et al. Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices. Light: Science & Applications, 9, 1427-1436 (2020).
DOI：

Jamadi, O. et al. Direct observation of photonic Landau levels and helical edge states in strained honeycomb lattices. Light: Science & Applications, 9, 1427-1436 (2020). DOI： 10.1038/s41377-020-00377-6.

摘要

Abstract

We report the realization of a synthetic magnetic field for photons and polaritons in a honeycomb lattice of coupled semiconductor micropillars. A strong synthetic field is induced in both the

and

orbital bands by engineering a uniaxial hopping gradient in the lattice

giving rise to the formation of Landau levels at the Dirac points. We provide direct evidence of the sublattice symmetry breaking of the lowest-order Landau level wavefunction

a distinctive feature of synthetic magnetic fields. Our realization implements helical edge sta

tes in the gap between

= 0 and

= ±1 Landau levels

experimentally demonstrating a novel way of engineering propagating edge states in photonic lattices. In light of recent advances in the enhancement of polariton–polariton nonlinearities

the Landau levels reported here are promising for the study of the interplay between pseudomagnetism and interactions in a photonic system.

关键词

Keywords

references

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