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SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 36: Poster: 2D Materials II

O 36.11: Poster

Tuesday, March 28, 2023, 18:00–20:00, P2/EG

Honeycomb structure of alkali metal atomsJiaqi Cai1,2,3, •Robin Ohmann1, Nicolae Atodiresei4, Hai Chau Nguyen1, David Duncan5, Caio Silva2, Christoph Schlueter5, Kai Mehlich1, Thais Chagas1, Vasile Caciuc4, Wouter Jolie3, Stefan Blügel4, Tien-Lin Lee5, Thomas Michely3, and Carsten Busse1,2,31Department Physik, Universität Siegen, Siegen, Germany — 2Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany — 3II. Physikalisches Institut, Universität zu Köln, Köln, Germany — 4Peter Grünberg Institut (PGI-1) and Institute for Advanced Simulation (IAS-1), Forschungszentrum Jülich and JARA, Jülich, Germany — 5Diamond Light Source, Didcot, Oxfordshire, United Kingdom

The formation of honeycomb structures, similar to graphene, is of great scientific and technological interest. Here, we show that the adsorption of Cs on monolayer hexagonal boron nitride (hBN) on Ir(111) substrate kept at elevated temperatures forms a honeycomb lattice. The structure is investigated by scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS) and X-ray standing waves (XSW) revealing that the Cs atoms are in registry with the moiré pattern of the substrate with a lattice constant of about 30 Å, are partially positively charged and have an adsorption height of 2.9 Å above the hBN layer. The formation is explained via the templating effect of the substrate. Our density functional theory (DFT) results confirm stable binding on the two hill regions of the moiré unit cell and predict a graphene like band structure with a band width of about 1 meV.

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