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O: Fachverband Oberflächenphysik

O 90: 2D Materials VI: Growth, Structure and Substrate Interaction

O 90.11: Talk

Thursday, March 21, 2024, 17:30–17:45, MA 005

A buckled honeycomb lattice of Fe atoms grown on a clean Be(0001) surface — •Stefan Krause, Hermann Osterhage, Karoline Oetker, Radek Dao, and Roland Wiesendanger — Department of Physics, University of Hamburg, Germany

The Be(0001) surface is considered to be an ideal model system to host a 2D electron gas with pronounced electron-electron and electron-phonon interactions that are decoupled from the bulk [1,2]. Consequently, growing magnetic adlayers on Be(0001) raises expectations for the emergence of novel electronic and magnetic phases that result from the interactions between the 2D electron gas and the magnetic atoms. Here we report on our experimental studies of the epitaxial growth of Fe on a clean Be(0001) surface using scanning tunneling microscopy at low temperature. Individual Fe atoms are found to replace Be atoms in the topmost Be(0001) surface layer, driven by an atomic exchange. Increasing the Fe coverage results in the self-terminated growth of ultrathin films consisting of atomically well-ordered patches with a p(2×2) superstructure. Based on the atomic structure of the FeBe₂ bulk alloy we develop an atomistic growth model, where the dosing of Fe transforms the topmost Be layer into a Kagome lattice that supports the formation of a 2D buckled honeycomb lattice of Fe atoms. The experimental results will be presented and discussed in terms of the atomic lattice structure and spectroscopic characteristics in comparison with the clean Be(0001) surface.

[1] P. T. Sprunger et al., Science 275, 1764 (1997).

[2] H.Osterhage et al., Phys. Rev. B 103, 155428 (2021).

Keywords: Beryllium; Iron; Buckled honeycomb lattice; Two-dimensional; Kagome lattice