Experimental demonstration of angular momentum-dependent topological transport using a transmission line network

Tianshu Jiang, Meng Xiao, Wen-Jie Chen, Lechen Yang, Yawen Fang, Wing Yim Tam and C. T. Chan ()
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Tianshu Jiang: Hong Kong University of Science and Technology
Meng Xiao: Hong Kong University of Science and Technology
Wen-Jie Chen: Hong Kong University of Science and Technology
Lechen Yang: Hong Kong University of Science and Technology
Yawen Fang: Hong Kong University of Science and Technology
Wing Yim Tam: Hong Kong University of Science and Technology
C. T. Chan: Hong Kong University of Science and Technology

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract Novel classical wave phenomenon analogs of the quantum spin Hall effect are mostly based on the construction of pseudo-spins. Here we show that the non-trivial topology of a system can also be realized using orbital angular momentum through a coupling between the angular momentum and the wave vector. The idea is illustrated with a tight-binding model and experimentally demonstrated with a transmission line network. We show experimentally that even a very small network cluster exhibits angular momentum-dependent one-way topological edge states, and their properties can be described in terms of local Chern numbers. Our work provides a new mechanism to realize counterparts of the quantum spin Hall effect in classical waves and may offer insights for other systems.

Date: 2019
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DOI: 10.1038/s41467-018-08281-9

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