SKM 2023 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 14: Nanostructures at Surfaces (joint session O/CPP)
O 14.2: Vortrag
Montag, 27. März 2023, 15:15–15:30, GER 39
Formation of an extended quantum dot array driven and auto protected by an atom thick h-BN layer — •Joel Deyerling1, Ignacio Piquero-Zulaica1, Mustafa A. Ashoush2, Knud Seufert1, Mohammad A. Kher-Elden2, Zakaria M. Abd El-Fattah2, and Willi Auwärter1 — 1Physics Department E20, Technical University of Munich, James-Franck-Straße 1, D-85748 Garching, Germany — 2Physics Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo E-11884, Egypt
Fabricating nanoarchitectures to confine two dimensional nearly free electrons on crystalline surfaces by tip manipulation with a scanning tunneling microscope (STM) or by applying supramolecular chemistry principles yields diverse artificial electronic structures. These electronic states are prone to scattering by adsorbates making them extremely susceptible to the environment. Nonetheless, little attention has been given to their protection, e.g., by an inert overlayer.
Here, we show that a quasi-hexagonal CuS nanoporous network can be formed at the h-BN/Cu(111) interface by thermally-induced sulfur segregation from the Cu(111) bulk. The growth and structure is characterized by STM and X-ray photoemission spectroscopy. We demonstrate by employing STM and scanning tunneling spectroscopy that within the pores of the network the surface state of Cu(111) as well as the image potential states of h-BN/Cu(111) are confined, effectively creating arrays of quantum dots with well-defined sizes that are covered by an inert h-BN overlayer.