Regensburg 2025 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
O: Fachverband Oberflächenphysik
O 33: Poster Graphene: Electronic Structure and Excitations
O 33.8: Poster
Tuesday, March 18, 2025, 13:30–15:30, P3
Intercalation of a condensed 2D-Ag phase within the epitaxial graphene/SiC interface — •Sawani Datta1, Vibha Reddy1, Bharti Matta1, Arpit Jain2, Kathrin Küster1, Joshua A. Robinson2 und Ulrich Starke1 — 1Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 2Pennsylvania State University, State College, USA
Intercalating 2D materials at the epitaxial graphene (EG)/SiC interface improves their environmental stability, facilitating the use of various ex-situ techniques for their fundamental study and application purposes. In a previous study, we showed that Ag atoms intercalated at the EG/SiC interface form a triangular (1×1) lattice with respect to the SiC and the Ag interlayer is semiconducting [1,2]. Interestingly, intercalating Pb into a previously Ag-intercalated sample results in the complete replacement of Ag by Pb. Subsequently, another round of Ag intercalation can entirely replace Pb, forming a new Ag phase characterized by a 4/3 packing of Ag with respect to the underlying Si layer. Theory suggested the existence of two intercalated 2D material phases also for several other materials [3] and Auger electron spectroscopy mapping indeed shows a higher Ag concentration of the latter Ag phase [4]. In this work, we compare the 2 different Ag phases by low-energy electron diffraction (LEED) and angle-resolved photoemission spectroscopy (ARPES). This ongoing study is supported by DFG through FOR 5242 and by NSF Grant DMR-2011839. [1] Phys. Rev. B 101, 201407(R) (2020). [2] Phys. Rev. B 105, 235428 (2022). [3] arXiv:2011.01914v1 (2020). [4] 2D Materials 8, 41003 (2021).
Keywords: epitaxial graphene; intercalation; silver; LEED; ARPES