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Topological kink plasmons on magnetic-domain boundaries

Nature Communications, ISSN: 2041-1723, Vol: 10, Issue: 1, Page: 4565
2019
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Article Description

Two-dimensional topological materials bearing time reversal-breaking magnetic fields support protected one-way edge modes. Normally, these edge modes adhere to physical edges where material properties change abruptly. However, even in homogeneous materials, topology still permits a unique form of edge modes – kink modes – residing at the domain boundaries of magnetic fields within the materials. This scenario, despite being predicted in theory, has rarely been demonstrated experimentally. Here, we report our observation of topologically-protected high-frequency kink modes – kink magnetoplasmons (KMPs) – in a GaAs/AlGaAs two-dimensional electron gas (2DEG) system. These KMPs arise at a domain boundary projected from an externally-patterned magnetic field onto a uniform 2DEG. They propagate unidirectionally along the boundary, protected by a difference of gap Chern numbers (± 1) in the two domains. They exhibit large tunability under an applied magnetic field or gate voltage, and clear signatures of nonreciprocity even under weak-coupling to evanescent photons.

Bibliographic Details

Jin, Dafei; Xia, Yang; Christensen, Thomas; Freeman, Matthew; Wang, Siqi; Fong, King Yan; Gardner, Geoffrey C.; Fallahi, Saeed; Hu, Qing; Wang, Yuan; Engel, Lloyd; Xiao, Zhi-Li; Manfra, Michael J.; Fang, Nicholas X.; Zhang, Xiang

Springer Science and Business Media LLC

Chemistry; Biochemistry, Genetics and Molecular Biology; Physics and Astronomy

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