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Ajith Ramachandran
복잡계 이론물리 연구단
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Unconventional Flatband Line States in Photonic Lieb Lattices

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Title
Unconventional Flatband Line States in Photonic Lieb Lattices
Author(s)
Shiqi Xia; Ajith Ramachandran; Shiqiang Xia; Denghui Li; Xiuying Liu; Liqin Tang; Yi Hu; Daohong Song; Jingjun Xu; Daniel Leykam; Sergej Flach; Zhigang Chen
Publication Date
2018-12
Journal
PHYSICAL REVIEW LETTERS, v.121, no.26, pp.263902 -
Publisher
AMER PHYSICAL SOC
Abstract
Flatband systems typically host “compact localized states” (CLS) due to destructive interference and macroscopic degeneracy of Bloch wave functions associated with a dispersionless energy band. Using a photonic Lieb lattice (LL), such conventional localized flatband states are found to be inherently incomplete, with the missing modes manifested as extended line states that form noncontractible loops winding around the entire lattice. Experimentally, we develop a continuous-wave laser writing technique to establish a finite-sized photonic LL with specially tailored boundaries and, thereby, directly observe the unusually extended flatband line states. Such unconventional line states cannot be expressed as a linear combination of the previously observed boundary-independent bulk CLS but rather arise from the nontrivial real-space topology. The robustness of the line states to imperfect excitation conditions is discussed, and their potential applications are illustrated.© 2018 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/5392
ISSN
0031-9007
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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