Screening in Graphene: Response to External Static Electric Field and an Image-Potential Problem
Abstract
We present a detailed first-principles investigation of the response of a free-standing graphene sheet to an external perpendicular static electric field E. The charge density distribution in the vicinity of the graphene monolayer that is caused by E was determined using the pseudopotential density-functional theory approach. Different geometries were considered. The centroid of this extra density induced by an external electric field was determined as zim = 1.048 Å at vanishing E, and its dependence on E has been obtained. The thus determined zim was employed to construct the hybrid one-electron potential which generates a new set of energies for the image-potential states.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 13, 2021
- Source ID
- 10.3390/nano11061561
Entities
People
- E. Kogan
- Godfrey Gumbs
- Vyacheslav Silkin
Organizations
- Air Force Research Laboratory
- Ministry of Science and Technology