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

Abstract

We investigate the structural and electronic properties of Li-intercalated monolayer graphene on SiC(0001) using combined angle-resolved photoemission spectroscopy and first-principles density functional theory. Li intercalates at room temperature both at the interface between the buffer layer and SiC and between the two carbon layers. The graphene is strongly $n$-doped due to charge transfer from the Li atoms and two $\pi$-bands are visible at the $\bar{K}$-point. After heating the sample to 300${}^{\circ }$C, these $\pi$-bands become sharp and have a distinctly different dispersion to that of Bernal-stacked bilayer graphene. We suggest that the Li atoms intercalate between the two carbon layers with an ordered structure, similar to that of bulk LiC${}_6$. An AA-stacking of these two layers becomes energetically favourable. The $\pi$-bands around the $\bar{K}$-point closely resemble the calculated band structure of a C${}_6$LiC${}_6$ system, where the intercalated Li atoms impose a super-potential on the graphene electronic structure that opens pseudo-gaps at the Dirac points of the two $\pi$-cones.

arXiv comment9 pages, 7 figures

References in corpus (13)

• The electronic properties of graphene
• Quasi-free Standing Epitaxial Graphene on SiC by Hydrogen Intercalation
• Evidence for superconductivity in Li-decorated monolayer graphene
• Highly-ordered graphene for two dimensional electronics
• Electronic decoupling of an epitaxial graphene monolayer by gold intercalation
• Characterization of graphene through anisotropy of constant-energy maps in angle-resolved photoemission
• Highly p-doped graphene obtained by fluorine intercalation
• Illuminating the dark corridor in graphene: polarization dependence of angle-resolved photoemission spectroscopy on graphene
• Direct measurement of quantum phases in graphene via photoemission spectroscopy
• Effective screening and the plasmaron bands in Graphene
• Energy gap opening in submonolayer lithium on graphene: Local density functional and tight-binding calculations
• Electronic structure of superconducting KC${}_8$ and non-superconducting LiC${}_6$ graphite intercalation compounds: Evidence for a graphene-sheet-driven superconducting state
• Graphene on graphene antidot lattices: Electronic and transport properties

Cited by in corpus (13)

• Experimental evidence of chiral symmetry breaking in Kekulé-ordered graphene
• Li-intercalated Graphene on SiC(0001): an STM study
• Self-energy dynamics and mode-specific phonon threshold effect in a Kekulé-ordered graphene
• Coexistence of extended flat band and Kekulé order in Li-intercalated graphene
• Electric-field control of a single-atom polar bond
• Strong two-dimensional plasmon in Li-intercalated hexagonal boron-nitride film with low damping
• Emergence of Kondo resonance in graphene intercalated with cerium
• Van Hove Singularity and Lifshitz Transition in Thickness-Controlled Li-Intercalated Graphene
• Berry phase shift from 2 $\pi$ to $\pi$ in Bilayer graphene by Li-intercalation and sequential desorption
• UV active plasmons in alkali and alkaline earth intercalated graphene
• Quasi-free-standing AA-stacked bilayer graphene induced by calcium intercalation of the graphene-silicon carbide interface
• Superconductivity and spin density wave in AA stacked bilayer graphene
• Two-dimensional superconductivity of the Ca-intercalated graphene on SiC: vital role of the interface between monolayer graphene and the substrate