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Observation of antichiral edge states in a circuit lattice

Science China Physics, Mechanics & Astronomy volume 64, Article number: 257011 (2021) Cite this article

Abstract

We construct an electrical circuit to realize a modified Haldane lattice exhibiting the phenomenon of antichiral edge states. The circuit consists of a network of inductors and capacitors with interconnections reproducing the effects of a magnetic vector potential. The next nearest neighbor hoppings are configured differently from the standard Haldane model, and as predicted by earlier theoretical studies, this gives rise to antichiral edge states that propagate in the same direction on opposite edges and coexist with bulk states at the same frequency. Using pickup coils to measure voltage distributions in the circuit, we experimentally verify the key features of the antichiral edge states, including their group velocities and ability to propagate consistently in a Möbius strip configuration.

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Authors and Affiliations

  1. School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, 221116, China

    YuTing Yang

  2. School of Physical Science and Technology & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China

    YuTing Yang, DeJun Zhu & ZhiHong Hang

  3. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore

    YuTing Yang & YiDong Chong

  4. Institute for Advanced Study, Soochow University, Suzhou, 215006, China

    ZhiHong Hang

  5. Centre for Disruptive Photonic Technologies, Nanyang Technological University, Singapore, 637371, Singapore

    YiDong Chong

Authors
  1. YuTing Yang
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  2. DeJun Zhu
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  3. ZhiHong Hang
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  4. YiDong Chong
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Corresponding authors

Correspondence to ZhiHong Hang or YiDong Chong.

Additional information

We thank You Wang, Qiang Wang and Udvas Chattopadhyay from Nanyang Technological University for helpful discussions. This work was supported by the National Natural Science Foundation of China (Grant Nos. 11874274, and 12004425), the Natural Science Foundation of Jiangsu Province (Grant Nos. BK20170058, and BK20200630), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). YiDong Chong was supported by the Singapore MOE Academic Research Fund Tier 3 (Grant No. MOE2016-T3-1-006).

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Yang, Y., Zhu, D., Hang, Z. et al. Observation of antichiral edge states in a circuit lattice. Sci. China Phys. Mech. Astron. 64, 257011 (2021). https://doi.org/10.1007/s11433-021-1675-0

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  • DOI: https://doi.org/10.1007/s11433-021-1675-0

Keywords

  • antichiral edge state
  • modified Haldane model
  • topological circuit