Topological kink plasmons on magnetic-domain boundaries

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

doi:10.1038/s41467-019-12092-x

Title: Topological kink plasmons on magnetic-domain boundaries

Journal Article · Tue Oct 08 00:00:00 EDT 2019 · Nature Communications

DOI:https://doi.org/10.1038/s41467-019-12092-x· OSTI ID:1591818

Jin, Dafei ^[1];

^[2]; Christensen, Thomas ^[3]; Freeman, Matthew ^[4]; Wang, Siqi ^[2]; Fong, King Yan ^[2]; Gardner, Geoffrey C. ^[5]; Fallahi, Saeed ^[5]; Hu, Qing ^[3]; Wang, Yuan ^[2]; Engel, Lloyd ^[4]; Xiao, Zhi-Li ^[6];

^[5]; Fang, Nicholas X. ^[3];

^[7]

Univ. of California, Berkeley, CA (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of California, Berkeley, CA (United States)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Purdue Univ., West Lafayette, IN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of California, Berkeley, CA (United States); Univ. of Hong Kong (China)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); Danish Council for Independent Research; US Air Force Office of Scientific Research (AFOSR); National Science Foundation (NSF)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; FG02-05ER46212; SC0006671; FA9550-12-1-0488; OSR-2016-CRG5-2950-03; DFF-6108-00667; DMR-0654118

OSTI ID:: 1591818

Alternate ID(s):: OSTI ID: 1604994

Journal Information:: Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 13 works

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