Plasmon Excitations for Encapsulated Graphene

Research paper by Godfrey Gumbs, Norman J. M. Horing, Andrii Iurov, Dipendra Dahal

Indexed on: 29 Mar '16Published on: 29 Mar '16Published in: Physics - Mesoscopic Systems and Quantum Hall Effect


We have developed an analytical formulation to calculate the plasmon dispersion relation for a two-dimensional layer which is encapsulated within a narrow spatial gap between two bulk half-space plasmas. This is based on a solution of the inverse dielectric function integral equation within the random-phase approximation (RPA). We take into account the nonlocality of the plasmon dispersion relation for both gapped and gapless graphene as the sandwiched two-dimensional (2D) semiconductor plasma. The associated nonlocal graphene plasmon spectrum coupled to the "sandwich" system is exhibited in density plots, which show a linear mode and a pair of depolarization modes shifted from the bulk plasma frequency.