Topologically protected Dirac plasmons in a graphene superlattice

Nature Communications
Deng PanF Javier García de Abajo

Abstract

Topological optical states exhibit unique immunity to defects, rendering them ideal for photonic applications. A powerful class of such states is based on time-reversal symmetry breaking of the optical response. However, existing proposals either involve sophisticated and bulky structural designs or can only operate in the microwave regime. Here we show a theoretical demonstration for highly confined topologically protected optical states to be realized at infrared frequencies in a simple two-dimensional (2D) material structure-a periodically patterned graphene monolayer-subject to a magnetic field of only 2 tesla. In our graphene honeycomb superlattice structures, plasmons exhibit substantial nonreciprocal behavior at the superlattice junctions under moderate static magnetic fields, leading to the emergence of topologically protected edge states and localized bulk modes. This approach is simple and robust for realizing topologically nontrivial optical states in 2D atomic layers, and could pave the way for building fast, nanoscale, defect-immune photonic devices.

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Citations

Apr 22, 2018·Nanoscale Research Letters·Pingping QiuJiao-Qing Pan
Sep 7, 2019·Physical Review Letters·Farzad Zangeneh-Nejad, Romain Fleury
Nov 22, 2018·Applied Optics·Zidong SongZhaoLu Wang
Apr 8, 2020·Science Advances·Jian Wei YouNicolae C Panoiu
Sep 8, 2018·Physical Review Letters·Minwoo JungGennady Shvets
Oct 23, 2019·Nature Communications·L XiongD N Basov
Mar 4, 2021·ACS Nano·Vivek SaraswatMichael S Arnold
Apr 15, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Thomas Benjamin SmithAlessandro Principi
Jun 20, 2021·Nature Communications·Sriram GuddalaAlexander B Khanikaev
Aug 21, 2021·Nano Letters·F J Alfaro-MozazA Y Nikitin
Jun 5, 2020·Chemical Reviews·Zhigao DaiQiaoliang Bao

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