Graphene on hexagonal boron nitride as a tunable hyperbolic metamaterial
| Autor: | Siyuan Dai, Fritz Keilmann, Mengkun Liu, Michael Goldflam, Martin Wagner, Michael M. Fogler, Qiong Ma, T. Taniguchi, G.C.A.M. Janssen, Mark H. Thiemens, Shou-En Zhu, Zhe Fei, Pablo Jarillo-Herrero, Dimitri Basov, Trond Andersen, Kenji Watanabe |
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| Přispěvatelé: | Massachusetts Institute of Technology. Department of Physics, Ma, Qiong, Andersen, Trond Ikdahl |
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Phonon Biomedical Engineering FOS: Physical sciences Physics::Optics Bioengineering Dielectric law.invention Condensed Matter::Materials Science symbols.namesake law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) cond-mat.mes-hall Physics::Atomic and Molecular Clusters Polariton General Materials Science Nanoscience & Nanotechnology Electrical and Electronic Engineering Condensed Matter::Quantum Gases Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Condensed Matter::Other Graphene Metamaterial Heterojunction Condensed Matter Physics Surface plasmon polariton Atomic and Molecular Physics and Optics symbols van der Waals force |
| Zdroj: | Nature nanotechnology, vol 10, iss 8 Dai, S; Ma, Q; Liu, MK; Andersen, T; Fei, Z; Goldflam, MD; et al.(2015). Graphene on hexagonal boron nitride as a tunable hyperbolic metamaterial. Nature Nanotechnology, 10(8), 682-686. doi: 10.1038/nnano.2015.131. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/7cz757ww arXiv |
| ISSN: | 1748-3395 1748-3387 |
| DOI: | 10.1038/nnano.2015.131 |
| Popis: | Hexagonal boron nitride (h-BN) is a natural hyperbolic material, for which the dielectric constants are the same in the basal plane (epsilon^t = epsilon^x = epsilon^y) but have opposite signs (epsilon^t*epsilon^z < 0) from that in the normal plane (epsilon^z). Due to this property, finite-thickness slabs of h-BN act as multimode waveguides for propagation of hyperbolic phonon polaritons - collective modes that originate from the coupling between photons and electric dipoles in phonons. However, control of these hyperbolic phonon polaritons modes has remained challenging, mostly because their electrodynamic properties are dictated by the crystal lattice of h-BN. Here we show by direct nano-infrared imaging that these hyperbolic polaritons can be effectively modulated in a van der Waals heterostructure composed of monolayer graphene on h-BN. Tunability originates from the hybridization of surface plasmon polaritons in graphene with hyperbolic phonon polaritons in h-BN, so that the eigenmodes of the graphene/h-BN heterostructure are hyperbolic plasmon-phonon polaritons. Remarkably, the hyperbolic plasmon-phonon polaritons in graphene/h-BN suffer little from ohmic losses, making their propagation length 1.5-2.0 times greater than that of hyperbolic phonon polaritons in h-BN. The hyperbolic plasmon-phonon polaritons possess the combined virtues of surface plasmon polaritons in graphene and hyperbolic phonon polaritons in h-BN. Therefore, graphene/h-BN structures can be classified as electromagnetic metamaterials since the resulting properties of these devices are not present in its constituent elements alone. 20 pages, 3 figures in Nature Nanotechnology 2015 |
| Databáze: | OpenAIRE |
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