Ultrastrong confinement,long lifetime,and gate-tunability of graphene plasmon polaritons(GPPs)motivate wide-ranging efforts to develop GPP-based active nanophotonic platforms.Incorporation of topological phenomena int...Ultrastrong confinement,long lifetime,and gate-tunability of graphene plasmon polaritons(GPPs)motivate wide-ranging efforts to develop GPP-based active nanophotonic platforms.Incorporation of topological phenomena into such platforms will ensure their robustness as well as enrich their capabilities as promising test beds of strong light–matter interactions.A recently reported approach suggests an experimentally viable platform for topological graphene plasmonics by introducing nanopatterned gates—metagates.We propose a metagate-tuned GPP platform emulating a second-order topological crystalline insulator.The metagate imprints its crystalline symmetry onto graphene by modulating its chemical potential via field-effect gating.Depending on the gate geometry and applied voltage,the resulting two-dimensional crystal supports either one-dimensional chiral edge states or zero-dimensional midgap corner states.The proposed approach to achieving the hierarchy of nontrivial topological invariants at all dimensions lower than the dimension of the host material paves the way to utilizing higher-order topological effects for onchip and ultracompact nanophotonic waveguides and cavities.展开更多
基金supported by the U.S.Army Research Office(ARO)under Grant No.W911NF-16-1-0319the National Science Foundation(NSF)under Grant Nos.DMR-1741788 and DMR-1719875support from the Kwanjeong Fellowship from the Kwanjeong Educational Foundation
文摘Ultrastrong confinement,long lifetime,and gate-tunability of graphene plasmon polaritons(GPPs)motivate wide-ranging efforts to develop GPP-based active nanophotonic platforms.Incorporation of topological phenomena into such platforms will ensure their robustness as well as enrich their capabilities as promising test beds of strong light–matter interactions.A recently reported approach suggests an experimentally viable platform for topological graphene plasmonics by introducing nanopatterned gates—metagates.We propose a metagate-tuned GPP platform emulating a second-order topological crystalline insulator.The metagate imprints its crystalline symmetry onto graphene by modulating its chemical potential via field-effect gating.Depending on the gate geometry and applied voltage,the resulting two-dimensional crystal supports either one-dimensional chiral edge states or zero-dimensional midgap corner states.The proposed approach to achieving the hierarchy of nontrivial topological invariants at all dimensions lower than the dimension of the host material paves the way to utilizing higher-order topological effects for onchip and ultracompact nanophotonic waveguides and cavities.
