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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Tianshu Jiang & Meng Xiao & Wen-Jie Chen & Lechen Yang & Yawen Fang & Wing Yim Tam & C. T. Chan, 2019. "Experimental demonstration of angular momentum-dependent topological transport using a transmission line network," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-018-08281-9
    DOI: 10.1038/s41467-018-08281-9
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