Structural and local electronic properties of clean and Li-intercalated graphene on SiC(0001)

被引：9
|
作者：
Omidian, M. [1 ]
Neel, N. [1 ]
Manske, E. [2 ]
Pezoldt, J. [3 ]
Lei, Y. [1 ]
Kroeger, J. [1 ]
机构：
[1] Tech Univ Ilmenau, Inst Phys, D-98693 Ilmenau, Germany
[2] Tech Univ Ilmenau, Inst Prozess & Sensortech, D-98693 Ilmenau, Germany
[3] Tech Univ Ilmenau, Inst Mikro & Nanoelekt, D-98693 Ilmenau, Germany
来源：
SURFACE SCIENCE | 2020年 / 699卷
关键词：
Graphene; SIC(0001); Lithium; intercalation; scanning tunnelling microscopy; scanning tunnelling spectroscopy; SCANNING-TUNNELING-MICROSCOPY; EPITAXIAL GRAPHENE; HETEROEPITAXIAL GRAPHITE; INTERFACE FORMATION; ATOMIC-STRUCTURE; SPECTROSCOPY; SUPERCONDUCTIVITY; 6H-SIC(0001); DEFECTS; STM;
D O I：
10.1016/j.susc.2020.121638
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
A low-temperature scanning tunnelling microscope (STM) has been used to study the graphene-SiC(0001) interface before and after Li intercalation. For clean graphene, spectroscopy of the differential conductance corroborates previous theoretical findings for the interfacial electronic structure (M. Kajihara et al., Surf. Sci. 647, 39 (2016)). An unambiguous relation between the spectroscopic onset of the interface states with changes in STM images is presented. Li intercalation leads to the disappearance of the 6 x 6 superstructure of clean graphene on SiC(0001) and efficiently suppresses the interface states. The additional doping of graphene due to the presence of Li is reflected by the shift of the Dirac point further below the Fermi energy.
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页数：7
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