Defect States Emerging from a Non-Hermitian Flatband of Photonic Zero Modes

We show the existence of a flatband consisting of photonic zero modes in a gain and loss modulated lattice system as a result of the underlying non-Hermitian particle-hole symmetry. This general finding explains the previous observation in parity-time symmetric systems where non-Hermitian particle-h...

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Bibliographic Details
Published in:Physical review letters Vol. 120; no. 9; p. 093901
Main Authors: Qi, Bingkun, Zhang, Lingxuan, Ge, Li
Format: Journal Article
Language:English
Published: United States American Physical Society 02.03.2018
Subjects:
Defects
Lattice vibration
Photonics
Symmetry
Unit cell
ISSN:0031-9007, 1079-7114, 1079-7114
Online Access:Get full text
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Summary:We show the existence of a flatband consisting of photonic zero modes in a gain and loss modulated lattice system as a result of the underlying non-Hermitian particle-hole symmetry. This general finding explains the previous observation in parity-time symmetric systems where non-Hermitian particle-hole symmetry is hidden. We further discuss the defect states in these systems, whose emergence can be viewed as an unconventional alignment of a pseudospin under the influence of a complex-valued pseudomagnetic field. These defect states also behave as a chain with two types of links, one rigid in a unit cell and one soft between unit cells, as the defect states become increasingly localized with the gain and loss strength.
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ISSN:0031-9007
1079-7114
1079-7114
DOI:10.1103/PhysRevLett.120.093901