Dresden 2020 – scientific programme
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O: Fachverband Oberflächenphysik
O 80: Poster Session - Graphene: Adsorption, Intercalation and Doping
O 80.3: Poster
Wednesday, March 18, 2020, 18:15–20:00, P2/EG
Structural and local electronic properties of clean and Li-intercalated graphene on SiC(0001) — •Maryam Omidian1, Nicolas Néel1, Eberhard Manske2, Jörg Pezoldt3, Yong Lei1, and Jörg Kröger1 — 1Institut für Physik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany — 2Institut für Prozess- und Sensortechnik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany — 3Institut für Mikro- und Nanoelektronik, Technische Universität Ilmenau, D-98693 Ilmenau, Germany
A low-temperature scanning tunneling microscope 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 induces a shift of the Dirac point to lower energies and efficiently suppresses the interface states.