On the charge transfer in the "single-sheet graphene-intercalated metal layer-SiC substrate" system

被引:2
|
作者
Davydov, S. Yu. [1 ,2 ]
机构
[1] Russian Acad Sci, Ioffe Phys Tech Inst, St Petersburg 194021, Russia
[2] St Petersburg Electrotech Univ LETI, St Petersburg 197376, Russia
基金
俄罗斯基础研究基金会;
关键词
DENSITY-OF-STATES; ELECTRONIC-PROPERTIES; ATOMS; ADSORPTION; FEATURES; SURFACE; MODEL;
D O I
10.1134/S1063783414020061
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The proposed scheme for the consideration of charge transfer in the three-layer Gr/Me/SiC system (where Gr is a single-sheet graphene, Me is an intercalated metal layer, and SiC is a substrate) contains three stages. At the first stage, a metal monolayer adsorbed on silicon carbide is considered and the charge of adatoms in this monolayer is calculated. At the second stage, the shift of the Dirac point of free-standing single-layer graphene in an electrostatic field induced by charged adatoms of the monolayer is estimated. At the third stage, a weak interaction between Me/SiC and free-standing graphene is included, which allows electrons to tunnel but does not significantly distort the density of states of free-standing graphene. Estimations are performed for n- and p-type 6H-SiC(0001) substrates and Cu, Ag, and Au layers. The charge state of the graphene sheet and the shift of the Dirac point with respect to the Fermi level of the system are calculated. A comparison with the available experimental and theoretical results shows that the proposed scheme works quite satisfactorily.
引用
收藏
页码:412 / 419
页数:8
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