Topologically Protected Edge State in Two-Dimensional Su–Schrieffer–Heeger Circuit

Liu, Shuo, Gao, Wenlong, Zhang, Qian, Ma, Shaojie, Zhang, Lei, Liu, Changxu, Xiang, Yuan Jiang, Cui, Tie Jun and Zhang, Shuang (2019) Topologically Protected Edge State in Two-Dimensional Su–Schrieffer–Heeger Circuit. Research, 2019. pp. 1-8. ISSN 2639-5274

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Topological circuits, an exciting field just emerged over the last two years, have become a very accessible platform for realizing and exploring topological physics, with many of their physical phenomena and potential applications as yet to be discovered. In this work, we design and experimentally demonstrate a topologically nontrivial band structure and the associated topologically protected edge states in an RF circuit, which is composed of a collection of grounded capacitors connected by alternating inductors in the x and y directions, in analogy to the Su–Schrieffer–Heeger model. We take full control of the topological invariant (i.e., Zak phase) as well as the gap width of the band structure by simply tuning the circuit parameters. Excellent agreement is found between the experimental and simulation results, both showing obvious nontrivial edge state that is tightly bound to the circuit boundaries with extreme robustness against various types of defects. The demonstration of topological properties in circuits provides a convenient and flexible platform for studying topological materials and the possibility for developing flexible circuits with highly robust circuit performance.

Item Type: Article
Additional Information: Research funded by Royal Society (2017YFA0700201111-2-056163100711874269734578 (D-SPA)TOPOLOGICAL2018M6331296157111761875133)
Subjects: F300 Physics
H600 Electronic and Electrical Engineering
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: Rachel Branson
Date Deposited: 13 Sep 2021 15:12
Last Modified: 13 Sep 2021 15:15

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