Observation of bulk Fermi arc and polarization half charge from paired exceptional points
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1709.03044.pdf
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Author(s)
Yoon, Yoseob
Hsu, Chia Wei
Nelson, Keith A.
Zhou, Hengyun
Peng, Chao
Fu, Liang
Joannopoulos, John
Soljacic, Marin
Zhen, Bo
Date Issued
December 2017
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Zhou, Hengyun, et al. “Observation of Bulk Fermi Arc and Polarization Half Charge from Paired Exceptional Points.” Science, Jan. 2018, p. eaap9859. © 2018 American Association for the Advancement of Science.
Version
Original manuscript
Abstract
The ideas of topology have found tremendous success in closed physical systems, but even richer properties exist in the more general open or dissipative framework. We theoretically propose and experimentally demonstrate a bulk Fermi arc that develops from non-Hermitian radiative losses in an open system of photonic crystal slabs. Moreover, we discover half-integer topological charges in the polarization of far-field radiation around the bulk Fermi arc. Both phenomena are shown to be direct consequences of the non-Hermitian topological properties of exceptional points, where resonances coincide in their frequencies and linewidths. Our work connects the fields of topological photonics, non-Hermitian physics and singular optics, providing a framework to explore more complex non-Hermitian topological systems.
MIT Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Physics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1126/science.aap9859
