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Moiré flat bands in strongly coupled atomic arrays

Dams, D. 1; Beutel, D. ORCID iD icon 1; Garcia-Santiago, X. 2; Rockstuhl, C. 1,2; Alaee, R. 1
1 Institut für Theoretische Festkörperphysik (TFP), Karlsruher Institut für Technologie (KIT)
2 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)


Moiré effects arise from stacking periodic structures with a specific geometrical mismatch and promise unique possibilities. However, their full potential for photonic applications has yet to be explored. Here, we investigate the photonic band structure for an atomic stack of strongly coupled linear arrays in the dipolar regime. A moiré parameter θ is used to parameterize a relative lattice constant mismatch between the two arrays that plays the role of a 1D twist angle. The system’s interaction matrix is analytically diagonalized and reveals the presence of localized excitations which strongly enhance the density of optical states in spectral regions that can be controlled via the moiré parameter. We also confirm our findings by numerical simulations of finite systems. Our work provides a better understanding of photonic moiré effects and their potential use in photonic devices such as optical sensors and light traps.

Verlagsausgabe §
DOI: 10.5445/IR/1000161329
Veröffentlicht am 11.08.2023
DOI: 10.1364/OME.486789
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Institut für Theoretische Festkörperphysik (TFP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 01.07.2023
Sprache Englisch
Identifikator ISSN: 2159-3930
KITopen-ID: 1000161329
HGF-Programm 43.32.02 (POF IV, LK 01) Designed Optical Materials
Erschienen in Optical Materials Express
Verlag Optica Publishing Group (OSA)
Band 13
Heft 7
Seiten 2003-2019
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 21.06.2023
Nachgewiesen in Web of Science
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