@article { ISI:000387538400002, title = {Epsilon-near-zero behavior from plasmonic Dirac point: Theory and realization using two-dimensional materials}, journal = {PHYSICAL REVIEW B}, volume = {94}, number = {20}, year = {2016}, month = {NOV 10}, abstract = {The electromagnetic response of a two-dimensional metal embedded in a periodic array of a dielectric host can give rise to a plasmonic Dirac point that emulates epsilon-near-zero (ENZ) behavior. This theoretical result is extremely sensitive to structural features like periodicity of the dielectric medium and thickness imperfections. We propose that such a device can actually be realized by using graphene as the two-dimensional metal and materials like the layered semiconducting transition-metal dichalcogenides or hexagonal boron nitride as the dielectric host. We propose a systematic approach, in terms of design characteristics, for constructing metamaterials with linear, elliptical, and hyperbolic dispersion relations which produce ENZ behavior, normal or negative diffraction.}, issn = {2469-9950}, doi = {10.1103/PhysRevB.94.201404}, author = {Marios Mattheakis and Constantinos A. Valagiannopoulos and Efthimios Kaxiras} }