SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Nanostructures at Surfaces (joint session O/CPP)

CPP 16.2: 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.