Plasmons in graphene nanoribbons: Interband transitions and nonlocal effects
Journal article, 2013

We study plasmon excitations in infinitely long graphene nanoribbons using a quasistatic approach, where one-dimensional coupled equations for electrostatic potential and excited charge density are derived in the transverse direction. By incorporating a hydrodynamical description of the excited charge density, we investigate nonlocal effects in plasmon excitations. Moreover, the method presented here provides means to look into the nonlocal plasmon response in more complex graphene nanostructures such as wedges. We find that the plasmon frequencies are lowered by interband transitions and raised due to nonlocal effects. The frequency shifts depend monotonically on the dielectric constant of the surrounding medium. Most importantly, the nonlocal effects can strongly affect the excited charge density at the edges. Finally, we show that a larger increase of dipolar plasmon frequencies occurs in smaller graphene nanoribbons as expected.

dielectric function

Author

Weihua Wang

Chalmers, Applied Physics, Condensed Matter Theory

Jari Kinaret

Chalmers, Applied Physics, Condensed Matter Theory

Physical Review B - Condensed Matter and Materials Physics

1098-0121 (ISSN)

Vol. 87 19

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Nano Technology

DOI

10.1103/PhysRevB.87.195424

More information

Created

10/8/2017