Scientific Results

Orbital Edge States in a Photonic Honeycomb Lattice

Year: 2017

Authors: Milicevic M., Ozawa T., Montambaux G., Carusotto I., Galopin E., Lemaitre A., Le Gratiet L., Sagnes I., Bloch J., Amo A.

Autors Affiliation: Univ Paris Saclay, Univ Paris Sud, CNRS, Ctr Nanosci & Nanotechnol,Marcoussis C2N, F-91460 Marcoussis, France; Univ Trento, INO CNR BEC Ctr, I-38123 Povo, Italy; Univ Trento, Dipartimento Fis, I-38123 Povo, Italy;‎ Univ Paris Saclay, Univ Paris Sud, CNRS, Phys Solides Lab, F-91405 Orsay, France

Abstract: We experimentally reveal the emergence of edge states in a photonic lattice with orbital bands. We use a two-dimensional honeycomb lattice of coupled micropillars whose bulk spectrum shows four gapless bands arising from the coupling of p-like photonic orbitals. We observe zero-energy edge states whose topological origin is similar to that of conventional edge states in graphene. Additionally, we report novel dispersive edge states in zigzag and armchair edges. The observations are reproduced by tight-binding and analytical calculations, which we extend to bearded edges. Our work shows the potentiality of coupled micropillars in elucidating some of the electronic properties of emergent two-dimensional materials with orbital bands.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 118 (10)      Pages from: 107403-1  to: 107403-6

KeyWords: TOPOLOGICAL INSULATORS; BLACK PHOSPHORUS; SURFACE-STATES; GRAPHENE; SYMMETRY; SYSTEMS; LIGHT
DOI: 10.1103/PhysRevLett.118.107403

Citations: 55
data from “WEB OF SCIENCE” (of Thomson Reuters) are update at: 2021-10-24
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