Topological kink plasmons on magnetic-domain boundaries

Dafei Jin, Yang Xia, Thomas Christensen, Matthew Freeman, Siqi Wang, King Yan Fong, Geoffrey C. Gardner, Saeed Fallahi, Qing Hu, Yuan Wang, Lloyd Engel, Zhi-Li Xiao, Michael J. Manfra, Nicholas X. Fang and Xiang Zhang ()
Additional contact information
Dafei Jin: University of California
Yang Xia: University of California
Thomas Christensen: Massachusetts Institute of Technology
Matthew Freeman: National High Magnetic Field Laboratory
Siqi Wang: University of California
King Yan Fong: University of California
Geoffrey C. Gardner: Purdue University
Saeed Fallahi: Purdue University
Qing Hu: Massachusetts Institute of Technology
Yuan Wang: University of California
Lloyd Engel: National High Magnetic Field Laboratory
Zhi-Li Xiao: Argonne National Laboratory
Michael J. Manfra: Purdue University
Nicholas X. Fang: Massachusetts Institute of Technology
Xiang Zhang: University of California

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract 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 ( $$\pm1$$ ± 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.

Date: 2019
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DOI: 10.1038/s41467-019-12092-x

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