Observation of bulk Fermi arc and polarization half charge from paired exceptional points
Abstract
Scattering topological effects are being explored in a variety of electronic and optical materials systems owing to their robustness against defects (see the Perspective by Özdemir). Yang et al. designed and fabricated an ideal optical analog of a three-dimensional Weyl system. Angular transmission measurements revealed four Weyl points at the same energy, as well as the signature helicoidal arcs associated with such an exotic topological system. Zhou et al. theoretically proposed and experimentally demonstrated the formation of a topologically protected bulk Fermi arc. They attributed the formation of the arc to the topological nature of paired exceptional points (points at which gain and loss in the system are matched). Photonic crystals may provide a powerful platform for studying exotic properties of topological electronic systems and may also be used to develop optical devices that exploit topological properties of light-matter interactions.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 02, 2018
- Source ID
- 10.1126/science.aap9859
Entities
People
- Bo Zhen
- Chao Peng
- Chia Wei Hsu
- Hengyun Zhou
- John D. Joannopoulos
- Keith A. Nelson
- Liang Fu
- Marin Soljačić
- Yoseob Yoon
Organizations
- Army Research Office
- China Scholarship Council
- Massachusetts Institute of Technology
- National Natural Science Foundation of China
- National Science Foundation
- Peking University
- Skolkovo Institute of Science and Technology
- United States Department of Energy
- University of Pennsylvania
- Yale University