Regensburg 2025 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 5: 2D Materials Beyond Graphene: Growth, Structure and Substrate Interaction (joint session O/HL)
HL 5.2: Vortrag
Montag, 17. März 2025, 15:15–15:30, H11
Growth of an Fe buckled honeycomb lattice on Be(0001) — Hermann Osterhage1, Abid H. Khan2, Karoline Oetker1, Radek Dao1, Samaneh Setayandeh2, Patrick Burr2, Roland Wiesendanger1, and •Stefan Krause1 — 1University of Hamburg, Germany — 2University of New South Wales, Sydney, Australia
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]. In a combined scanning tunneling microscopy (STM) and density functional theory (DFT) study the growth of Fe on a clean Be(0001) surface is investigated on the atomic scale [3]. At low Fe coverage, the nucleation of terraced nanoislands with a disordered surface is observed experimentally with STM. Increasing the Fe coverage results in the growth of extended films exhibiting a well-ordered p(2×2) superstructure. DFT is applied to investigate the growth of Fe on a Be(0001) surface from individual atoms to extended films.
The Fe buckled honeycomb lattice formation on Be(0001), as derived from our study, provides evidence for the realization of a very peculiar non-trivial electronic and magnetic model system. The results will be presented and discussed in terms of their implications for the emergence of novel electronic and magnetic phases resulting from the interactions between the 2D electron gas and the magnetic atoms.
[1] P. T. Sprunger et al., Science 275, 1764 (1997).
[2] H. Osterhage et al., Phys. Rev. B 103, 155428 (2021).
[3] H. Osterhage et al., Surf. Sci 752, 122609 (2025).
Keywords: Beryllium; Iron; Buckled honeycomb lattice; Two-dimensional; Kagome lattice