Real and imaginary edge states in stacked Floquet honeycomb lattices

Please always quote using this URN: urn:nbn:de:bvb:20-opus-232347
  • We present a non-Hermitian Floquet model with topological edge states in real and imaginaryband gaps. The model utilizes two stacked honeycomb lattices which can be related via four different typesof non-Hermitian time-reversal symmetry. Implementing the correct time-reversal symmetry provides uswith either two counterpropagating edge states in a real gap, or a single edge state in an imaginary gap.The counterpropagating edge states allow for either helical or chiral transport along the lattice perimeter.In stark contrast, we find that the edgeWe present a non-Hermitian Floquet model with topological edge states in real and imaginaryband gaps. The model utilizes two stacked honeycomb lattices which can be related via four different typesof non-Hermitian time-reversal symmetry. Implementing the correct time-reversal symmetry provides uswith either two counterpropagating edge states in a real gap, or a single edge state in an imaginary gap.The counterpropagating edge states allow for either helical or chiral transport along the lattice perimeter.In stark contrast, we find that the edge state in the imaginary gap does not propagate. Instead, it remainsspatially localized while its amplitude continuously increases. Our model is well-suited for realizing theseedge states in photonic waveguide latticesshow moreshow less

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Metadaten
Author: Alexander Fritsche, Bastian Höckendorf, Andreas Alvermann, Holger Fehske
URN:urn:nbn:de:bvb:20-opus-232347
Document Type:Journal article
Faculties:Fakultät für Physik und Astronomie / Institut für Theoretische Physik und Astrophysik
Language:English
Parent Title (English):The European Physical Journal B
ISSN:1434-6028
Year of Completion:2020
Volume:93
Issue:151
Source:The European Physical Journal B (2020) 93: 151 https://doi.org/10.1140/epjb/e2020-10233-0
DOI:https://doi.org/10.1140/epjb/e2020-10233-0
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Tag:edge states; lattices
Release Date:2021/05/18
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International