Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Poster Monday: 2D Materials 1

O 18.17: Poster

Montag, 5. September 2022, 18:00–20:00, P4

Artificial electronic lattices on InAs(111)A — •Rian Ligthart and Ingmar Swart — Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht, The Netherlands

Artificial electronic lattices are a promising tool to elucidate novel effects in the quantum world. The Scanning Tunnelling Microscope (STM) allows to build the lattices by manipulating atoms with nanoscale precision and to probe the electronic properties. The electronic lattices consist of artificial atoms on a metallic/semiconducting crystal with a surface state which acts as a 2D electron gas (2DEG). The 2DEG is patterned by scatterers on the surface creating artificial atoms. The versatile artificial atoms are used in lattices to study the effect of structure on electronic characteristics.

An already well-known system is CO on Cu(111), however, this system has a low energy resolution of 80 mV due to coupling of the surface state with bulk states. Here, the promising InAs(111)A surface with native In adatoms is studied since it has a higher energy resolution of around 5 meV. Vertical manipulation allows to place multiple In-adatoms in vicinity of each other. The In adatoms create a potential well that confines the surface state electrons of InAs. The artificial atom created can be coupled into dimers with different bond strengths by varying the distance or by introducing bridge sites. The artificial electronic lattices created on InAs(111)A can help to probe new characteristics in the lattices due to the vastly improved energy resolution.