Anisotropic low-energy plasmon excitations in doped graphene: An ab initio study
Journal article, 2011

Low-energy electronic excitations in free-standing graphene (gr) and gr(2 x 2)/K interface have been studied based on ab initio band structure and linear-response theory. For pristine graphene, the calculated linear dispersion of collective interband transitions around the Dirac cone is in good agreement with experiments. At the gr/K interface, in addition to the doping-enhanced linear mode, a nonlinear plasmon develops with increasing momentum transfers along the Gamma K direction. Using a model-doped freestanding graphene, we revealed that the nonlinear mode originates from the anisotropic band dispersion at the Fermi level, and its collectivity emerges as the carrier density increases. These findings have implications for measurements of electronic excitations in metal-supported graphene sheet.

Graphene

electron-gas

dynamics

Surfaces and interfaces

Time-dependent

density functional theory

Dielectric response

Author

Y. Gao

Chinese Academy of Sciences

Zhe Yuan

Chalmers, Applied Physics, Materials and Surface Theory

Solid State Communications

0038-1098 (ISSN)

Vol. 151 14-15 1009-1013

Areas of Advance

Nanoscience and Nanotechnology (SO 2010-2017, EI 2018-)

Materials Science

Subject Categories

Physical Sciences

Condensed Matter Physics

Roots

Basic sciences

DOI

10.1016/j.ssc.2011.05.001

More information

Latest update

10/2/2018