IntroductionMany researchers have been devoting a great deal of effort to exploit the unique transport and optical properties of graphene. In particular, an area of much interest to both experimentalists and theoreticians has been the study of plasmon excitations under various conditions of temperature and doping concentrations. There have been many recent works focused on the study of these plasmon modes in graphene when it is free standing, lying on a substrate, or encapsulated by two conducting materials. In this paper, we investigate the way in which the plasmon mode excitations for a pair of graphene layers are affected by encapsulating conductors which are coupled nonlocally to the two‐dimensional (2D) layers.The unusual properties of free‐standing graphene may be attributed to Bloch states in the corners of the hexagonal Brillouin zone of this 2D honeycomb crystal lattice. For example, the Dirac fermions arising from this energy band structure lead to strongly enhanced and confined local fields through dipole–dipole coupling. But, recently, novel properties have been predicted when graphene electrically interacts with a nearby metallic substrate separated by a thin insulator. The graphene‐insulator‐metal plasmons have exhibited both a linear dispersion mode (a so‐called acoustic plasmon) in the terahertz (THz) spectral regime
Physica Status Solidi (B) Basic Solid State Physics – Wiley
Published: Jan 1, 2018
Keywords: ; ;
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