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Title: Observation of photonic antichiral edge states
Authors: Zhou, Peiheng
Liu, Gui-Geng
Yang, Yihao
Hu, Yuan-Hang
Ma, Sulin
Xue, Haoran
Wang, Qiang
Deng, Longjiang
Zhang, Baile
Keywords: Science::Physics
Issue Date: 2020
Source: Zhou, P., Liu, G., Yang, Y., Hu, Y., Ma, S., Xue, H., Wang, Q., Deng, L. & Zhang, B. (2020). Observation of photonic antichiral edge states. Physical Review Letters, 125(26), 263603-.
Project: MOE2016-T3-1-006
Journal: Physical Review Letters
Abstract: Chiral edge states are a hallmark feature of two-dimensional topological materials. Such states must propagate along the edges of the bulk either clockwise or counterclockwise, and thus produce oppositely propagating edge states along the two parallel edges of a strip sample. However, recent theories have predicted a counterintuitive picture, where the two edge states at the two parallel strip edges can propagate in the same direction; these anomalous topological edge states are named as antichiral edge states. Here, we report the experimental observation of antichiral edge states in a gyromagnetic photonic crystal. The crystal consists of gyromagnetic cylinders in a honeycomb lattice, with the two triangular sublattices magnetically biased in opposite directions. With microwave measurement, unique properties of antichiral edge states have been observed directly, which include tilted dispersion, chiral-like robust propagation in samples with certain shapes, and 100% scattering into backward bulk states at certain terminations. These results extend and supplement the current understanding of chiral edge states.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.125.263603
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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