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arXiv · 1702.02553

Infrared Topological Plasmons in Graphene

Dafei Jin·Thomas Christensen·Marin Soljačić·Nicholas X. Fang·Ling Lu·Xiang Zhang
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Abstract

We propose a two-dimensional plasmonic platform - periodically patterned monolayer graphene - which hosts topological one-way edge states operable up to infrared frequencies. We classify the band topology of this plasmonic system under time-reversal-symmetry breaking induced by a static magnetic field. At finite doping, the system supports topologically nontrivial bandgaps with mid-gap frequencies up to tens of terahertz. By the bulk-edge correspondence, these bandgaps host topologically protected one-way edge plasmons, which are immune to backscattering from structural defects and subject only to intrinsic material and radiation loss. Our findings reveal a promising approach to engineer topologically robust chiral plasmonic devices and demonstrate a realistic example of high-frequency topological edge state.

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Dafei Jin, Thomas Christensen, Marin Soljačić, Nicholas X. Fang, Ling Lu, Xiang Zhang. 2017-02-08. Infrared Topological Plasmons in Graphene. https://doi.org/10.1103/physrevlett.118.245301

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