Graphene on hexagonal boron nitride as a tunable hyperbolic metamaterial.

@article{Dai2015GrapheneOH,
  title={Graphene on hexagonal boron nitride as a tunable hyperbolic metamaterial.},
  author={Siyuan Dai and Qiong Ma and Mengkun Liu and Trond I. Andersen and Z Fei and Michael D. Goldflam and Martin Wagner and Kenji Watanabe and Takashi Taniguchi and Mark H. Thiemens and F Keilmann and Gerard Janssen and S-E Zhu and Pablo Jarillo-Herrero and M. M. Fogler and Dimitri N. Basov},
  journal={Nature nanotechnology},
  year={2015},
  volume={10 8},
  pages={682-6}
}
Hexagonal boron nitride (h-BN) is a natural hyperbolic material, in which the dielectric constants are the same in the basal plane (ε(t) ≡ ε(x) = ε(y)) but have opposite signs (ε(t)ε(z) < 0) in the normal plane (ε(z)). Owing to this property, finite-thickness slabs of h-BN act as multimode waveguides for the 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… CONTINUE READING
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