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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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.
DepartmentMassachusetts Institute of Technology. Institute for Soldier Nanotechnologies; Massachusetts Institute of Technology. Department of Physics
American Association for the Advancement of Science (AAAS)
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.