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O: Fachverband Oberflächenphysik
O 94: 2D Materials V: Novel Systems
O 94.2: Talk
Friday, April 5, 2019, 10:45–11:00, H9
Stabilizing Plumbene on Fe/Ir(111): a combined experimental and theoretical study — •Gustav Bihlmayer1, Jonas Sassmannshausen2, André Kubetzka2, Kirsten von Bergmann2, Roland Wiesendanger2, and Stefan Blügel1 — 1Peter Grünberg Institut & Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — 2Department of Physics, University of Hamburg, D-20355 Hamburg, Germany
As a heavy analog of graphene, plumbene is a two-dimensional material with strong spin-orbit effects. Although not a topological insulator, in external fields plumbene can realize a promising platform for topological phenomena [1]. Therefore, the synthesis of Pb monolayers with honeycomb structure is of substantial interest. On hexagonal substrates like Ir(111) a c(2x4) structure is found like in the graphene intercalated films on Ir [2]. In contrast, scanning tunneling microscopy images show that on a Fe covered Ir(111) surface Pb forms a honeycomb lattice. We use density functional theory calculations to rationalize these findings and analyse the impact of the hybridization on the plumbene band structure. In the unoccupied states the splitting of the Dirac cone by spin-orbit interaction is clearly observed and the influence of the iron’s exchange field as function of magnetization direction is studied. In the occupied states of the freestanding plumbene we find a band inversion that leads to a topologically non-trivial gap, which undergoes strong hybridization with the substrate states.
[1] X.-L. Yu et al., Phys. Rev. B 95, 125113 (2017).
[2] F. Calleja et al., Nature Phys. 11, 43 (2015).