Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Monday: 2D Materials 1

O 18.14: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Structural investigation of Pb intercalated graphene on SiC — •Shaista Andleeb, Julian Koch, Chitran Ghosal, and Christoph Tegenkamp — Institut für Physik, TU Chemnitz, Reichenhainerstr. 70, 09126 Chemnitz

In order to modify the electronic properties of graphene, intercalation experiments have received a lot of attention recently. In this research, we examined the intercalation of Pb on carbon buffer layer on SiC(0001) using SPA-LEED and STM. The samples were prepared in UHV by several cycles of Pb deposition using MBE at RT followed by annealing at temperatures ranging from 500 to 900^∘.

In LEED the intercalated phase shows six characteristic spots around the (00)-spots, which we correlated with a striped phase in STM. The local structure on the stripes shows two honeycomb Pb layers with approximately twice the lattice constant of graphene and turned by ±7.5^∘ with respect to graphene. The corresponding spots in LEED coincide with two buffer layer spots. Their energy dependent behavior was analyzed.