Journal
PHYSICAL REVIEW LETTERS
Volume 120, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.217401
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Funding
- National Natural Science Foundation of China [11574226, 11675116]
- Natural Science Foundation of Jiangsu Province [BK20170058]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- WPI Initiative on Materials Nanoarchitectonics, Ministry of Education, Cultures, Sports, Science and Technology, Japan
- Japan Society for Promotion of Science [17H02913]
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We demonstrate experimentally that a photonic crystal made of Al2O3 cylinders exhibits topological time--reversal symmetric electromagnetic propagation, similar to the quantum spin Hall effect in electronic systems. A pseudospin degree of freedom in the electromagnetic system representing different states of orbital angular momentum arises due to a deformation of the photonic crystal from the ideal honeycomb lattice. It serves as the photonic analogue to the electronic Kramers pair. We visualized qualitatively and measured quantitatively that microwaves of a specific pseudospin propagate only in one direction along the interface between a topological photonic crystal and a trivial one. As only a conventional dielectric material is used and only local real--space manipulations are required, our scheme can be extended to visible light to inspire many future applications in the field of photonics and beyond.
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