Structural stability and electronic properties of graphene/germanene heterobilayer

Document Type

Article

Publication Date

9-1-2021

Abstract

In this work, the structural and electronic properties of graphene/germanene heterobilayer is investigated by using density functional theory. We find that the graphene and germanene are bounded together mainly by weak van der Waal forces. This is supported by small interlayer binding energy of graphene/germanene heterobilayer. In the heterobilayer, the Dirac cone characteristics of both graphene and germanene layers are well preserved. The band gap opening is found due to the unsaturated p(z)-orbital of germanene layer. Further variation of compressive strain along the normal of the heterobilayer increases the band gap opening in the heterobilayer. Inhomogeneous charge redistribution is found in between graphene and germanene layer, where small charge accumulation region is found in germanene layer while charge depletion region in graphene layer. The total charge accumulations in between graphene and germanene sheets is 5.645 x 10(-4) e.

Keywords

Density functional theory, Graphene, Germanene, Two-dimensional materials, Heterobilayer

Publication Title

Results in Physics

Divisions

PHYSICS

Funders

Fundamental Research Grant Scheme (FRGS) by Ministry of Higher Education (FRGS/1/2016/STG02/UPM/02/1)

Volume

28

Publisher

Elsevier

Publisher Location

RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS

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