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Observation of bulk Fermi arc and polarization half charge from paired exceptional points

Author(s)
Yoon, Yoseob; Hsu, Chia Wei; Nelson, Keith A.; Zhou, Hengyun; Peng, Chao; Fu, Liang; Joannopoulos, John; Soljacic, Marin; Zhen, Bo; ... Show more Show less
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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.
Date issued
2017-12
URI
http://hdl.handle.net/1721.1/113662
Department
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of Physics
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
ISSN
0036-8075
1095-9203

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