Substrate induced bandgap in multilayer epitaxial graphene on the 4H-SiC (000(1)over-bar) surface

作者：Chen Mohan; Sun Wenlu; Guo Guang Can; He Lixin^*

来源：Physica Status Solidi B-Basic Solid State Physics, 2011, 248(7): 1690-1695.

DOI：10.1002/pssb.201046560

• density functional theory
• graphene
• multilayers
• screening effects
• SiC

We have investigated the electronic structures of graphene layers epitaxially grown on the 4H-SiC (000 (1) over bar) surface up to six layers by using first-principles methods. The graphene layers grown on an ideal SiC interface are found to be p doped, whereas, those grown on a C-deficient SiC interface are found to be n doped. We discuss the interlayer screening effects from the positions of the Fermi levels of each layer in our simulation. Interestingly, we find that the substrate may induce small atomic distortions in the graphene layers which could open about a 10 meV band gap in each graphene layer.

• 出版日期2011-7
• 单位中国科学技术大学